I can confirm on various browsers (Arc, Safari, etc) and this should be cross-browser.
The culprit is this Media Query + selector:
@media (min-width: 768px) and (max-width: 991.98px) {
.LinksButton-title {
display: none;
}
}
Which is meant to hide the text of the main nav items, but also affects the dropdown items.
One solution is to change the query to e.g.
@media (min-width: 768px) and (max-width: 991.98px) {
.Header-controls>li>a>.LinksButton-title {
display: none;
}
}
Which produces the following:
(some spacing fixes are needed, but that should be good enough to get started)