We first suggest you clear our the cache (temporary memory) for your internet browser. You may also want to clear out your cookies  to remedy the problem. Once these files have been removed you may want to try restarting your computer. Also check to make sure your library card  and PIN  are not being automatically filled in when you are logging in. If they are you may want to clear your stored login and password  information.
If you have tried all of these things and are still having problems please contact us at (859)-231-5500 and pick option #4  to speak with library staff.