Did some more testing today and found that the issue is only present at exactly attribute level 5. If I have Strength5 the script spits out Strength6 flag. But if I actually have Strength6 I only get 6 (and not 7). So it's only giving me an extra flag on level 5.

I tried this up to level 10 and got the same results.
5=6
6=6
7=7
8=8
etc.

My D:OS Mods:
Dunamis - A 15 hour Adventure Mod for D:OS EE

A Necromancer's Crusade - 10 hour adventure mod for D:OS EE

4 Character Creation (EE)