casino says my win needs manual approval because bet size changed during session

never ran into this one before - i was spinning slots, adjusted my bet size a couple times, and hit a decent bonus. now the casino says my win needs “manual approval” since i changed bets during the session. they’re acting like that’s suspicious somehow. never saw any rule about not switching bet sizes, and i do it all the time to keep variance in check. wondering if this is just a stall tactic or if anyone else got hit with this before. really starting to wonder about the transparency on these sites and how much freedom we actually have during play.