BUG? Setting bookmark while in word wrap is on sets bookmark in wrong line

PSPad 5.0.7 (32b) on Windows 11.

I have a plain text file with many long lines so I turn word wrap on. When I go to line 6359 to set a bookmark with CTRL-SH-5, it actually sets the bookmark on line 6353, at least that's where the red number in a square appears. When I go back up to line 1, then hit CTRL-5 I go to the right line, so just the 5 in the red square is on the wrong line.

Perhaps this is just an issue of where the red number in a box displays.

Thanks!