Hi,
I've had the same problem.
The issue occurs only on the exported template and not internally to TT.
I fixed it with this CSS:
.nav.ttr_menu_items li a.ttr_menu_items_parent_link_arrow, .nav.ttr_menu_items li span.separator.ttr_menu_items_parent_link_arrow {
padding-top: 0 !important;
padding-bottom: 0 !important;
}
I don't know if it depends on a TT bug or a wrong setting in TT (which I haven't found) but this CSS seems to fix it removing vertical padding from these elements.
Regards