Submission Form Not Functioning on Mobile

I have tried to use both a normal module and UABB Submission Form to add a contact to an ActiveCampaign list with tag.

The page is

It works on desktop but not on mobile. The following steps have been tried to remedy:

  1. disabled caching on that page
  2. disabled wp fastest cache plugin
  3. deleted form and re-added (sorry)
  4. disabled all plugins except for beaver builder plugins
  5. cleared cache several times

It just doesn’t work on mobile and I have no idea why.

Thanks for any advice.

Have you looked in the browser dev console? When you click the submit button you get the following error from some custom JS you added.

(index):123 Uncaught TypeError: Cannot read property 'top' of undefined
    at HTMLAnchorElement.<anonymous> ((index):123)
    at HTMLAnchorElement.dispatch (jquery.js?ver=1.12.4-wp:3)
    at HTMLAnchorElement.r.handle (jquery.js?ver=1.12.4-wp:3)