Site navigation is not working on iOS with pages including 3rd party iFrame. Help?

Question:
Recently my mobile site navigation on iOS devices specifically stopped working when users access two pages on my site that include a 3rd party iFrame from my POS/booking platform provider (Mariana Tek). Provider says problem is not on their side. Wix Support says they can’t help either. Can anyone help a DIY “developer” figure this out?

I developed the site using Wix Studio, and implemented the iFrames using Custom Elements, following instructions provided from my POS/booking provider. Everything worked for months, but recently stopped working as intended.

Specific pages on my site are: