The link that appears below each imported question does bad things.
For example, look at this imported question: What's the difference between the "smooth" strings and the "rough" strings?
The guitars.stackexchange.com link goes to this address:
Despite the "noredirect", it redirects. It redirects to an answer with ID 540 on this site:
This is obviously unintended, and due to the fact that the migrated-from site no longer exists.