anyone notice blackjack results change when you bet higher amounts

I've been tracking my blackjack sessions for a while, keeping receipts and screenshots just so I know I’m not losing my mind. It honestly feels like the cards get way colder whenever I up my bet, especially when I'm using crypto. When I stick to low stakes, I get a decent mix - win some, lose some - but as soon as I push a bigger chip out there, the dealer starts hitting those crazy 21s like it’s scripted. I'm not saying it’s rigged, but my stats for bigger hands are just flat-out worse.

I know randomness is a thing, but this pattern keeps popping up enough that I’m starting to second guess myself. Anyone else keeping records and seeing the same weird swings, or is it just a run of bad variance for me?