Before I updating the plug-ins, my registration page on Androids would show up on the screen. I added the multiple registration add on and now on android, I have to scroll around to find the pop-up box. It appears to work on Apple.
Adding padding changes the dimensions of the page, it will now always be 1000px wider than it actually needs to be. The modal centres itself using the current viewport dimension so if those are off by 1000px it throw the modal out.
Remove padding-right: 1000px; from the above and it will fix the modal again.