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Hello TerryBryan,
Thank you very much for such a quick reply.
I did try to set z-index:999 on .positionHelper, but that did not fix the issue.
All menu items are generated dynamically.
Here is the code of one of the menu items:

<ul aria-hidden="false" aria-expanded="false" class="ui-menu ui-widget ui-widget-content ui-corner-all"
    role="menu" contentEditable="inherit" sizcache03392690264908838="9888 43 447461"
    jQuery182001445584620387963="103">
    <li class="ui-menu-item" role="presentation" contentEditable="inherit" sizcache03392690264908838="9943 43 450931">
        <a aria-haspopup="true" id="ui-id-258" class="ui-corner-all" role="menuitem" tabindex="-1" contentEditable="inherit" sizcache03392690264908838="42 39 461">
        <span class="ui-menu-icon ui-icon ui-icon-carat-1-e" contentEditable="inherit" jQuery182001445584620387963="192">
        <span class="ui-icon ui-icon-folder-collapsed" contentEditable="inherit"></a>
        <ul aria-hidden="false" aria-expanded="false" class="ui-menu ui-widget ui-widget-content ui-corner-all" role="menu" contentEditable="inherit" jQuery182001445584620387963="104">
            <li class="ui-menu-item" role="presentation" contentEditable="inherit">
                <a id="ui-id-268" class="ui-corner-all" role="menuitem" tabindex="-1" contentEditable="inherit" href="\<some_url\>">
                UserName
                </a>
            </li>
            <li class="ui-menu-item" role="presentation" contentEditable="inherit">
                <a id="ui-id-269" class="ui-corner-all" role="menuitem" tabindex="-1" contentEditable="inherit" href="\<some_url\>">
                HR_TERM
                </a>
            </li>
        </ul>
    </li>
</ul>

Thanks for your help.

Issure resolved.
Added:
.ui-menu {
    z-index:99999;
}
rule to my css file.

Thanks a lot for your help.