Playing $1/2 at the local casino. I play there all the time im a straight shooter/nit I play my hand dont angle people and go about my day

Run of the mill pot heads up against a reg. Something like $40 in the pot on the river (nothing of significance). Villain is first to act, im not watching him but dealer says “check to you” I check back and flip over my cards. As soon as I flip them villain puts out $25 and says “I never checked”. Dealer claims bet stands? She claims it’s a dealer mistake and floor upholds her decision, I just folded and didn’t end up making a huge fuss about it because of the small dollar amount but I did argue it, based on the fact that I think it’s fucked up he was able to bet after I had already checked? Like what’s to prevent someone from just saying they didn’t check any other time? Seemed sketchy, I would have lost anyway so maybe I’m wrong just curious what others think