right hand white space on mobile

Hello,

I am working with Panino theme and have a single long home page, which works fine except when I view it on mobile there is a fixed white gap to the right. This does not appear in the responsive breakout, but on a live test it is there and I can't find what is causing it.

See attached - Any ideas?

I can grant support access so you can take a look, it is on a site within my multisite.

Thanks
Scott