They're artifacts. Some browsers just have glitches like that and it can be very hard determining the fix. In this particular case, it also appears to be related to the lack of a right border on the the UL's (a change you made to the css). We can fool Chrome into thinking there is one though. Add the highlighted to the stylesheet:
Code:
.flexdropdownmenu, .flexdropdownmenu ul{ /*topmost and sub ULs, respectively*/
font-family: Verdana, Arial, Helvetica, sans-serif;
font-size:14px;
font-weight:500;
/*font: normal 14px Verdana; */
text-align:left;
margin: 0;
padding: 0;
position: absolute;
left: 0;
top: 0;
list-style-type: none;
background: #FFF;
border-right: 1px solid transparent;
/* border: 1px solid black; */
border-bottom-width: 0;
visibility: hidden;
display: none; /*collapse all sub me
That fixes it here, other browsers should either ignore that, or be OK with it.
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