If in page B there is already at least one link to page A and page A is mentioned more times in page B, page B will be shown both under Linked mentions and Unlinked mentions. This makes Unlinked mentions misleading and less useful.
It’s easier to show an example: in this example page A is “couscous”. Look at how all linked mentions show up in unlinked mentions just because the recipes repeat the word “couscous” several times:
There should at least be an option to, if page B is already listed under Linked mentions, not list it under Unlinked mentions.