The cutoff doesn't seem to be working correctly. Based on what I'm seeing it might be using the number as absolute rather than maximum.

Eg: a cutoff of 4, ONLY shows complete sets and sets with 4 pieces missing, rather than 4 or fewer.

Check if this is still occurring. I found an error in the filtering logic and it should be fixed now.

It's also not consistent, and many sets appear missing regardless, such as I don't see ANY of the Nathria Plate sets, though I have the entire mythic one.

I am missing Bones of the Bloodhunter (trading post set) from the sets tab. Doesn't appear with or without a search term. It does show up in the stock blizzard sets tab. Version 5.2.5.

@ascott18 The missing sets should be fixed in the next update