Occasionally, after having voted, in the Chatterbox nodelet I get some text like the following:

You have 7 votes left today.?
You gained 2 experience points. Void where prohibited.

(This is just grabbed from the page source, wrapped in <blockquote> and edited with a minimal substitution.)

Is this meant to be there? The different formatting makes me suspect it may be a bug. Or else if it should be an informative message, then it's not informative enough.