BNB staking APY

Somebody any idea why the BNB staking APY on Binance is diving? On Trust Wallet it’s almost double. When I started my 90 day locked staking the APY on Binance was 12.49% then we came down to 9,x%, now it’s 8,69%. In under 10 days 33% less APY. I don’t know, i mean if you call something „locked staking“ you probably shouldn’t just change relevant points of the contract like the APY? Am i missing something here or is Binance just pocketing more like they started doing for about a week now with BETH staking? Staking APY there fell about 25%, too. And no, it has nothing to do with on chain metrics. Any ideas?