I'm not sure if this is working as intended (don't think so?), but, when you use "Insert X additional links from project," SER will sometimes re-insert the same link (domain) inside the same article (using the same anchor as the first instance).
Meaning, it doubles up links to a certain domain instead of making all the additional links unique, i.e., X random (unique) links per entry.
Is this supposed to happen? Note: This is on actual submission, not only in preview mode.