Did you find a solution to this? I have the exact same issue.
I haven’t used any coding yet, I’ve just used wix’s drag and drop tools to build my site.
I am using two dropdown menus that are fully functional on the web browser version of my site but they don’t work on the mobile version.
Like yours, they are connected to a repeater and produce data based on the viewers dropdown selection.
Any help to get these dropdown menus working on mobile would be massively appreciated!