IFrames not responding properly on pages

Hello,

We are using the Scribe theme currently. Originally, the theme was not mobile responsive. I had to have one our IT contractors add code to the theme to make it so it looked correct on mobile. Since then, all of the pages and post pages look good on both desktop and mobile.

However, the issue now is, when putting iframe codes on the pages (which have enabled protection on them via Membership Pro 2), they were not responding to mobile but looked fine on desktop. When the iframe code was changed to look good on mobile, it now overlaps on the desktop.

I've attached screen shots to show you. We think it might be a theme issue and were hoping you could point us in the right direction.

Thank you,

Annemarie