Welcome.

It sounds to me as though they have too much time on their hands (paws) and maybe a cat tree, with lots of places to hide, explore etc. would keep them occupied.

I have a kitty named Lucy. Lucy has had a few spins in the washer (as a wee kitten) and has never gone near the washer again. She survived it, as I have a front load washer and she wasn't in there very long, but it scared the heck out of me....and her..... I have one other cat that made it into the dryer for a couple of turns as well. The secret to this game is to continually wonder where the cats are...... They will outgrow it, I promise.

Welcome again. Enjoy the friends here.