Knowing anything about your setup in detail, it is for me not possible to see the exact issue.
But what i can tell, is that wix has issues when it comes to mobile versions. If you use the SEARCH-BAR, you will find a lot of post talking about your mentioned problem, where users have difficulties to generate a good looking responsive mobile version.
Some notes about Wix-difficulties which are current existing, you will find here…
But what could help you out is to generate for your mobile-version an additional page, that means, you would have two different pages (a / b). One for DESKTOP-VERSION and another one for MOBILE-VERSION.
Then you can use the following API to detect the users DEVICE and decide which ob pages (a / b) to show.