Bug Report - Debuff issue

In the picture u can see in my gameplay, i debuffed ‘BoMangles’ by 318 using my ‘Woolly Bully’ but the effect it only decreased by 8, from 446 to 438. I thought it is because that ‘BoMangles’ is a mechanical, but why does the attack is decreased by 8 and not 0. Is it a bug or it is just a game feature?

Thank you!

he’s standing on a stim pad, which upgrade the attack by 325

Judging by the stimpad, this does seem to be working as intended. As the above comment mentioned, they likely are utilizing that stim pad to negate the debuff.