What is the other word for text "overlapping"?

I would say that one line of text is superimposed on the other.

I agree superimposed. You probably could use misaligned also.

“Mooshed” is a more colloquial term.

Mooshed is not for formal communication in business, just to make it clear for @lessonenglish. I do use the word a lot casually though.

Can either of glitchy or wonky work?

Those are broader terms for things gone wrong. They don’t describe the actual problem.

Wonky will not work in America, we don’t use the word. Glitchy is not necessarily correct. If you say the words overlapped because of a glitch in the programming that would make sense.

Tangled, Layered, Garbled, Scrunched?

Yes. Gllitchy means bug or flaw, but Wonky means misalignment

I think superimposed would be better to use.

Who is your audience, client? All English speakers? Americans? Brits? Superimposed and misaligned I think are the best if you are talking to all English speakers.

Client who’s from U.S.

Ok, that is very important. Do not use wonky or glitchy.

Yes. Thanks!! :)

Are you filing a bug report, @lessonenglish?

Your example shows poor web coding or bad page rendering..

@Jeruba : Yes. I was filing a bug report.
@blueiiznh : Poor web coding this would generally be used in development.