[Bug] Double posting from Quick Replies

Seems as of late that every time I put a Quick Reply in a thread, I get the "WARNING: You must wait 30 seconds to post" thingy. It appears that the site thinks I'm double-clicking the "post" button. Uhm, help?
I get that frequently, but mainly just when I try to post something so hot on the heels of posting in another thread.

Windows and a mouse that has seen a fair bit of use? Sometimes Windows will have a momentary hiccup and register single left clicks as two.