…they’re trying to vet what you see again. Go to mentions; click ‘Settings.’ See if that, under Advanced, the ‘Quality Filter’ box is checked. If it is (mine was), congratulations: Twitter has decided that it can guess what replies you want to see!
As usual, Twitter is bad at guessing.
PS: I’m on it because Twitter has been known to send traffic to my Patreon. These days, every little bit helps.