I've had it glitch out like this before, and sometimes it won't accept my log-in at all. A solution I found was to right click on one of the options and open it in a new tab. Or use the url donate.noobstown.com. Something about opening the Donate page in its own tab removes the problem, as opposed to using it on the main noobstown website.

Hm, my computer is actually set to always clean the cache when I "log off" the internet. So while that might help others with a similar problem (that might yield the same error) it doesn't seem to help in my case.

However, ummfred's solution was not only simple but it did actually work in my case. I'll add it to the op in case someone else has that problem someday and searches for a solution.