[Plugin: NextGEN Gallery Voting] Voting results visible in Safari not in Firefox

Hi guys,

I just noticed a strange thing when voting is done with the dropdown rating system.
The website: https://www.ticor.be/eco-expo_test

In safari the results after voting are visible as you can see here (screenshot): https://ticor.be/misc/safaritest.png

In Firefox the dropdown rating system is visible, but after you rated an image the “current average” isn’t visible anymore.
See screenshot: https://ticor.be/misc/test2.png

When selecting I see it is there. Screenshot: https://ticor.be/misc/test.png
So it seems the “current average” is shown in the background color.

Anyone who knows what is wrong?

Thank you very much in advance.