wagering bar went backwards after i cashed a small win, how does that even happen

so i hit a tiny win on a live roulette promo, not even enough to bother cashing out but i wanted to check if i could withdraw a slice just to be sure. i swear the little progress bar tracking the wagering actually dropped back instead of moving forward. it was at like 70%, i cashed the small bit, checked again and now it’s chilling at 64%. what kind of twilight zone math is that? it’s like cashing out gives you negative progress.

i’ve always side-eyed these promo meters since some of them are as reliable as a plastic roulette wheel. anyone else ever had their bar go in reverse after a withdrawal, or am i just not reading the fine print with enough paranoia?