diff --git a/src/edit.c b/src/edit.c
index 9cc55ef..97e4224 100644
--- a/src/edit.c
+++ b/src/edit.c
@@ -693,7 +693,7 @@
 			&& stop_arrow() == OK)
 		{
 		    ins_compl_delete();
-		    ins_compl_insert(FALSE, FALSE);
+		    ins_compl_insert(FALSE);
 		}
 		// Delete preinserted text when typing special chars
 		else if (IS_WHITE_NL_OR_NUL(c) && ins_compl_preinsert_effect())
diff --git a/src/insexpand.c b/src/insexpand.c
index 2d39887..94eb760 100644
--- a/src/insexpand.c
+++ b/src/insexpand.c
@@ -2378,7 +2378,7 @@
     if (compl_match_array == NULL)
 	compl_enter_selects = FALSE;
     else if (ins_compl_has_preinsert() && compl_leader.length > 0)
-	ins_compl_insert(FALSE, TRUE);
+	ins_compl_insert(TRUE);
 }
 
 /*
@@ -5235,6 +5235,12 @@
 
 	    compl_started = FALSE;
 	}
+
+	// For `^P` completion, reset `compl_curr_match` to the head to avoid
+	// mixing matches from different sources.
+	if (!compl_dir_forward())
+	    while (compl_curr_match->cp_prev)
+		compl_curr_match = compl_curr_match->cp_prev;
     }
     cpt_sources_index = -1;
     compl_started = TRUE;
@@ -5404,12 +5410,11 @@
 
 /*
  * Insert the new text being completed.
- * "in_compl_func" is TRUE when called from complete_check().
  * "move_cursor" is used when 'completeopt' includes "preinsert" and when TRUE
  * cursor needs to move back from the inserted text to the compl_leader.
  */
     void
-ins_compl_insert(int in_compl_func, int move_cursor)
+ins_compl_insert(int move_cursor)
 {
     int		compl_len = get_compl_len();
     int		preinsert = ins_compl_has_preinsert();
@@ -5442,8 +5447,6 @@
 	set_vim_var_dict(VV_COMPLETED_ITEM, dict);
     }
 #endif
-    if (!in_compl_func)
-	compl_curr_match = compl_shown_match;
 }
 
 /*
@@ -5638,8 +5641,7 @@
     int	    allow_get_expansion,
     int	    count,		// repeat completion this many times; should
 				// be at least 1
-    int	    insert_match,	// Insert the newly selected match
-    int	    in_compl_func)	// called from complete_check()
+    int	    insert_match)	// Insert the newly selected match
 {
     int	    num_matches = -1;
     int	    todo = count;
@@ -5700,7 +5702,7 @@
     else if (insert_match)
     {
 	if (!compl_get_longest || compl_used_match)
-	    ins_compl_insert(in_compl_func, TRUE);
+	    ins_compl_insert(TRUE);
 	else
 	    ins_compl_insert_bytes(compl_leader.string + get_compl_len(), -1);
     }
@@ -5786,7 +5788,7 @@
 	    c = safe_vgetc();	// Eat the character
 	    compl_shows_dir = ins_compl_key2dir(c);
 	    (void)ins_compl_next(FALSE, ins_compl_key2count(c),
-				      c != K_UP && c != K_DOWN, in_compl_func);
+				      c != K_UP && c != K_DOWN);
 	}
 	else
 	{
@@ -5809,7 +5811,7 @@
 	int todo = compl_pending > 0 ? compl_pending : -compl_pending;
 
 	compl_pending = 0;
-	(void)ins_compl_next(FALSE, todo, TRUE, in_compl_func);
+	(void)ins_compl_next(FALSE, todo, TRUE);
     }
 }
 
@@ -6656,7 +6658,7 @@
     // Find next match (and following matches).
     save_w_wrow = curwin->w_wrow;
     save_w_leftcol = curwin->w_leftcol;
-    n = ins_compl_next(TRUE, ins_compl_key2count(c), insert_match, FALSE);
+    n = ins_compl_next(TRUE, ins_compl_key2count(c), insert_match);
 
     // may undisplay the popup menu
     ins_compl_upd_pum();
diff --git a/src/proto/insexpand.pro b/src/proto/insexpand.pro
index 8965aca..0564008 100644
--- a/src/proto/insexpand.pro
+++ b/src/proto/insexpand.pro
@@ -63,7 +63,7 @@
 void f_complete_check(typval_T *argvars, typval_T *rettv);
 void f_complete_info(typval_T *argvars, typval_T *rettv);
 void ins_compl_delete(void);
-void ins_compl_insert(int in_compl_func, int move_cursor);
+void ins_compl_insert(int move_cursor);
 void ins_compl_check_keys(int frequency, int in_compl_func);
 int ins_complete(int c, int enable_pum);
 void free_insexpand_stuff(void);
diff --git a/src/testdir/test_ins_complete.vim b/src/testdir/test_ins_complete.vim
index 155c5b7..df59e1e 100644
--- a/src/testdir/test_ins_complete.vim
+++ b/src/testdir/test_ins_complete.vim
@@ -4754,6 +4754,73 @@
   delfunc TestComplete
 endfunc
 
+" Verify that the order of matches from each source is consistent
+" during both ^N and ^P completions (Issue #17425).
+func Test_complete_with_multiple_function_sources()
+  func F1(findstart, base)
+    if a:findstart
+      return col('.') - 1
+    endif
+    return ['one', 'two', 'three']
+  endfunc
+
+  func F2(findstart, base)
+    if a:findstart
+      return col('.') - 1
+    endif
+    return ['four', 'five', 'six']
+  endfunc
+
+  func F3(findstart, base)
+    if a:findstart
+      return col('.') - 1
+    endif
+    return ['seven', 'eight', 'nine']
+  endfunc
+
+  new
+  setlocal complete=.,FF1,FF2,FF3
+  inoremap <buffer> <F2> <Cmd>let b:matches = complete_info(["matches"]).matches<CR>
+  call setline(1, ['xxx', 'yyy', 'zzz', ''])
+
+  call feedkeys("GS\<C-N>\<F2>\<Esc>0", 'tx!')
+  call assert_equal([
+        \ 'xxx', 'yyy', 'zzz',
+        \ 'one', 'two', 'three',
+        \ 'four', 'five', 'six',
+        \ 'seven', 'eight', 'nine',
+        \ ], b:matches->mapnew('v:val.word'))
+
+  call feedkeys("GS\<C-P>\<F2>\<Esc>0", 'tx!')
+  call assert_equal([
+        \ 'seven', 'eight', 'nine',
+        \ 'four', 'five', 'six',
+        \ 'one', 'two', 'three',
+        \ 'xxx', 'yyy', 'zzz',
+        \ ], b:matches->mapnew('v:val.word'))
+
+  %delete
+
+  call feedkeys("GS\<C-N>\<F2>\<Esc>0", 'tx!')
+  call assert_equal([
+        \ 'one', 'two', 'three',
+        \ 'four', 'five', 'six',
+        \ 'seven', 'eight', 'nine',
+        \ ], b:matches->mapnew('v:val.word'))
+
+  call feedkeys("GS\<C-P>\<F2>\<Esc>0", 'tx!')
+  call assert_equal([
+        \ 'seven', 'eight', 'nine',
+        \ 'four', 'five', 'six',
+        \ 'one', 'two', 'three',
+        \ ], b:matches->mapnew('v:val.word'))
+
+  bwipe!
+  delfunc F1
+  delfunc F2
+  delfunc F3
+endfunc
+
 func Test_complete_fuzzy_omnifunc_backspace()
   let g:do_complete = v:false
   func Omni_test(findstart, base)
diff --git a/src/version.c b/src/version.c
index 05e85ad..52fdfc3 100644
--- a/src/version.c
+++ b/src/version.c
@@ -710,6 +710,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1471,
+/**/
     1470,
 /**/
     1469,