Forgetting authors, misspelling them or the journals, putting a wrong digit etc... could be citation typos. I don't see how you add 5 non-existing authors and put a different—but conceptually plausible—journal in the bibtex.

Besides, I would think most people are using bibliographic managers like Zotero&co..., which will pull metadata through DOIs or such.

The errors look a lot more like what happens when you ask an LLM for some sources on xyz.