Would you mind providing the URL of the page where the issue is happening and also tell us which section. I also could not imagine how this issue could happen so can you also provide a series of screenshots or a screen recording so we could see what’s happening?
For the meantime, if you’re using custom HTML in your page, please ensure there are no syntax errors or broken tags as that usually is a common cause of broken layouts.
If you could also give us WordPress Admin access, that would be great so we could experience the issue you described. Please post credentials in a secure note.