Status: Fixed for next update.
Looks like there is a side effect of the white out.
In the first picture, the "05" of the swimmers look normal.
However, after you use up the swimmer then press the replay hotkey, the "05" looks weird (in the second picture).
Oops, I did notice that but thought I had fixed it. I'll get that one next time. :P
Okay, I know why this one slipped under the radar. I tested using Lemmings Plus III, specifically the level "Extra Skill Required", so I could test both pickup skills and restarting at the same time. And - this bug only happens when displaying a two digit number (either due to a leading zero, or a quantity of 10 or higher). Since Lemmings Plus III displays single-digit numbers without a leading zero, and that level doesn't have any skills with a two-digit quantity, the bug didn't trigger there.
And - fixed for the next update. :)