1- Sorry for the trouble. Yes…those FAQs errors are indeed the fault of the related plugin.
2- True, I think the ads plugin is causing this (not in the non-amp though). Also, not all amp pages have this issue (also not every time). Ads are going out of the container and sometimes the width of the container itself getting smaller than the original. However, I can’t find any such pages at the moment. I’ve provided the link of the page which was getting this error yesterday.
3- The original search bar which is in the non-amp version in the header part. I have enabled this option for amp version too but it’s not showing there.