Menu, on hover dissapears

On this site when you hover over the Sustainable Pillars in IE and FX the hover will at times disappear when you are trying to get to something. I have tried adjusting the margins and nothing.
Johanna AlbeeAsked:
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Change your top setting on the sub menu to 1.90em
Johanna AlbeeAuthor Commented:
That made it better in IE, but Firefox still glitchy
1.87em seems to work fine in both

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Johanna AlbeeAuthor Commented:
had to add this

/*Fix for Firefox sub menu */
.sub-menu {
    margin-top: -1px !important;
Johanna AlbeeAuthor Commented:
ah I will try that!
Johanna AlbeeAuthor Commented:
Thank you that is the cleaner preferred way!
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