Bassistance.de VALIDATE Plugin

Bassistance.de VALIDATE Plugin

Hi everybody; I'm experiencing an issue with the bassistance.de validation plugin. Is very simple by the way. I'm trying to validate a few <select> elements and, when the option has an empty value, on the submit it validates correctly, but at the moment I drop down the list, triggers again the validation of the focused select, and even I select an option the class, error doesn't seem to go away, ever after the blur of that select. Just when I click or dropdown the list again is where the error class goes away ...

Any clues ??
Resuming, how is the thing with the selects in the plugin ??
Thanks in advance !!