[gizmo]

How about trying:
.tabs a:hover {
text-decoration:underline;
height: auto;



}

Or maybe also/and/or

.tabs a:link, .tabs a:visited, .tabs a:hover, .tabs a:active {
-moz-background-clip:border;
-moz-background-inline-policy:continuous;
-moz-background-origin:padding;
background:transparent none repeat scroll 0 0;
color:#F1F377 !important;
font-size:12px;
height:auto; (Try setting this to px say 20px )

margin:10px 5px 0 0;
padding:0 10px 5px 15px;
text-transform:uppercase;


}



I see what you mean even on demo site the hover over state is strange within that design.

I cannot replicate this as not tried this theme