Domain in links changes randomly - base url issue?

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:

Or hardcoded like:

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

I'm at a complete loss!!!!

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