To fix this try:
Look in Settings / Site Options / Layout / Multi Column Menu / Menu Theme and note down what's set there.
Go to Design / Library / Layouts / Multi Column Menu and open the <Menu Theme> entry from above.
Look for a block of code starting with ul#topnav li { like the following from the configurable style:
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ul#topnav li {
float: left;
height: 27px;
margin: 0; padding: 0;
border-right: <actinic:variable name="MenuTopBarSeparator" />;
position: relative; /*--Important--*/
z-index: 8888;
}
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z-index: 8888;
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/* z-index: 8888; */