...wow... I can't believe I missed that.
Thanks a lot for the help, especially since it had nothing to do with your plugin after all.
What's really strange, though, is that it was a copy/paste of the same code in my main side bar (just a standard text widget), but the main side bar didn't behave in the same way, leading me to believe it was related to the plugin. Oh well.
Thanks again for the help!