I do not have a minimum workable example that I can put here, because this involves an unpublished paper. However, I can try to create an example if nobody has seen this before.
I have a paper in which footnotes (which are in a smaller font) in the left column are getting intermingled with text from the right column, which is flowing down underneath the right-column footnotes. This doesn't happen on the first page. This doesn't happen all the time. It's very weird.
Has anyone seen this before?