Throbber duplicated for Continue button when AJAX used on page

Normally when you press the Continue button, it will be grayed out and a throbber will appear beside it indicating the form has been submitted. However, when an element on the page triggers some AJAX event via the Forms API and the Continue button is clicked, the throbber is duplicated for as many times as you performed the event. This is comical but visually unnerving... ; )

I'm thinking maybe every time the form is reloaded the behavior is getting attached to that button again. Should be easy to check and avoid, right? : P