I think it appears due to this daily quest:

I'm not sure why this shows in here, but it remains even with the Collectible As Cost logic modified to always return false, so it may have been happening from before that.

@ImUnicke, yes, I went as far back as version 2.0.9 (first SL version, BfA is incompatible now) and it was always there, we just haven't noticed.

I feel like the best way to adjust this functionality is to only pull 'collectible' Things which require that Profession into the respective Profession list, instead of everything tagged for that Profession and allowing the List to filter itself based on the user's current filters.
So if I enable "Collect Repeatable Quests" I get this:

And if it is opened while disabled:

The Profession list data will only re-update itself if you open a different Profession though, so there's that caveat.

can we close this issue, it woud seem that you restructured professions and factions are not under them any more.

Nothing changed, faction is still in the list

Still the case sometimes. Example, Cooking->Outdoor zones->Northrend->Dalaran->Faction->Faction #1124. I think it is Horde equivalent of The Silver Covenant, you'll need Account Mode to see it on your Alliance character.
User report

Seeing this on 8ad7c53.

I always sort of hated having quests nested underneath factions. I feel like that'd be the true solution to this "problem".

In the case of Northrend Dalaran it is a vendor, not quests.