[resolved] Summary Data only updates with a "second click"

I'm using Fivestar v5.x-1.5 with Drupal v5.1 and have noticed that when casting a vote, the stars change state but the summary data doesn't refresh unless I cast my vote a second time (click again on the star image).

This only happens the first time I vote on a Node. If I change a vote on a node that I've already voted on, the stars and the summary data update with a single click.

Has anyone else noticed this behavior?

Thanks,
Kevin