I set up an auction earlier today and had it set to end at 3pm GT today. None of the horses sold, the auction got "cancelled" for some reason. All the horses are still listed as in an auction. Whenever I try to make a new auction, it will say "oops! horse already entered in an auction."

I don't think this is a bug. After a auction you have to wait 24 hours*I think, it may be 48 hrs* Before you can start another auction

No, it's not that. It's actually letting me make an auction less than even 24 hours after my last one *finished* (even though the game cancelled it just out of the blue)

All my horses also show this:

Still having this problem and all 8 horses are stuck in my stable

I would message Eve about this since this thread is from last year, and yes it still shows your horses in an auction when it should have been way over.

Fixed, thanks!