I've owned several.
Cats emote a lot with their tails. And when they move fast it gets very frantic, because it's where half their center of balance comes from.
Take a look at any cat jumping in slow mo, their tails are all over the place

Oh right makes sense. I've never really looked close, just looked okay to me due to lack of expert knowledge..
If that's the case then I hope they have updated it..
Sometimes it pays not to know how RL works when playing games..
Edit: I know they move their tales, I just didn't know they did it while jumping etc. My cat was too lazy to move much anyway.