Domain in links changes randomly - base url issue?

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Please help. This started happening recently I can't figure out what's going on! No matter how I code links in my site, with the content editor, which makes urls like:
https://csuglobal.edu/index.php?cID=281...

Or hardcoded like:
https://csuglobal.edu/graduate/specializations/fraud-management...

Once in a while, seemingly randomly, the "rendered" link is a different domain! What in the world is going on!?!? Like: mta-sts.mail.higheredformodernlearners.com (we own this domain but don't use it, see attached image). Sometimes it'll just change csuglobal.edu to csuglobal.org?

I'm at a complete loss!!!!

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