@raaber,
I have seen some interesting joint errors, too. I believe in my case they were from joints that I had deleted, but somehow the model still thought they were present. Here are a few posts that discuss (what I believe is) similar behavior:
https://forums.autodesk.com/t5/design-validate-document/compute-all-results-in-errors-that-cannot-be...
https://forums.autodesk.com/t5/design-validate-document/how-can-i-fix-that-joint-warning/m-p/6655948...
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Lenovo Thinkpad P1, 2.70 GHz Intel Xeon, 32.0 GB, Windows 10 Pro
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