Hi jross
Actually, the tab titles are showing there but a 3rd party extension on your site called jomcomdev component overrides style of the title - it forces the title color to white so you don't see them.
I added this custom css:
.acm-container-tabs .nav-tabs .nav-link.active, .acm-container-tabs .nav-tabs .nav-item .nav-link {
color: #495057 !important;
}
in template settings: https://prnt.sc/tjhwig to fix it. Kindly check.