“amount due” won’t change

I payed the $265 that my financial aid didn’t cover and it all went through (on my bank and in the uh payment history). I checked the day after and it showed the amount due was $0. I checked today and it now shows i still owe the same amount. Did this happen with anyone else before? Is it just an error? Also do if I pay it again and it ends up being some glitch, will they refund me for the second payment? thanks!