I’ve checked to see on the designer, also in xray mode, to see if any elements are larger than they should, but everything seems to be within the screen size. It doesnt scroll left and right in the designer mobile view mode.
Odd thing is that everytime I scroll down to the Blog Section, the entire site becomes normal, not scrolling left and right:
Ok, so you have an animation when one of the team members info sliding in from the right side. Initial state of that column cause the overflow and that is why you have this horizontal issue.
Set the row, which contains the team members info to overflow: hidden. Should fix the problem