This is really strange … so it’s trying to fetch profiles but then complains that the GUIDs already exist? Have you checked if the GUIDs really already exist and if so, to which other profile/pod they belong?
On diaspora you can get the GUID of a user it tried to fetch by going to this URL: https://venera.social/.well-known/webfinger?resource=acct:email@example.com which should then respond with a JSON and there should be an element with
rel: "http://microformats.org/profile/hcard", and the
href of this element, contains already the GUID as last part.
But it looks like the profile that causes issues is from a friendica server, and there it’s a bit more complicated, because you actually need to go to the hCard and then in the html source there should be an element
class="entity_uid" which contains the GUID.
Then you can check in your database if there already is a person with that GUID, and for which profile it is, and if all are from the same pod or what’s going on.
But without knowing which profiles/GUIDs/pods are affected there is not much I can do to help you. This should never happen since GUIDs should be unique, but maybe a pod tried to change their domain (which is not supported) and now all users are duplicated with the same GUID, but since it’s a new domain, your pod doesn’t know them with the new domain and tries to fetch them, but the GUID is still used by the same user from the old domain …