Hello,

Your issue has been resolved. The issue was due to the CSS that you added in the Global Custom CSS area under Theme Settings >> Custom CSS.

I have checked by removing it and the titles are displayed.

Screenshot for Clarification: https://ibb.co/Tcrs7L2

The CSS I removed from the Theme Settings is as follows:

/*nasconde label sui checkout field*/

label {
    display: none;
}

Regard’s.
Xtemos Studio.