Select options disappear on hover

Hi Everyone!!!

I'm rewriting this question since it was deleted in the latest T3 meltdown. My sympathies to the T3 team and everyone who lost their data - I lost 3 community points :[

I wrote some code in a custom module that includes a simple select field but when you try to hover over the options, they disappear and can't be selected.

This issue is only happens in the following situations:

Using Firefox browser - all other browsers are fine
T3 template - other templates work fine
Inside a custom module - The markup in the page content works fine


Notes:

This is not a css issue - I matched the broken module's markup css with working markup in the page content
Since css is not to blame, I suspect there is some sort of conflict with Javascript and the T3 template - but I get no console errors.



Can anyone else confirm???

THANKS!!!