Training Arena's broken

I didn't think anything of it yesterday
but today kind of panicked.

So i checked.

ALL my paints were on the same training days, same exact. now i know there is something wrong with training.

While i am doing the training, for a few horses or so, it'll say "You've already trained this horse today" Which i havent, im not double clicking, im not refreshing, im not doing anything different. But it doesn't do it for every horse.
It's annoying due to the inconvenience of missing days and now it's taking longer to get the boosts, plus the schedule for my horses are now completely messed up.

I'm not sure what's wrong, and there's no error code.