Your comments

Can you give me an example series that is missing?  I will look into this ASAP.

Is this a trading card game of some kind?  or a set that is part of an existing card game we already have?  Please let me know more info.

I'm not quite sure I understand.  Can you give me an example search that does this?  or send me a screenshot of what you are seeing?

You can do that.  You log into your account.  Do a search.  Then change the category of that search to "video games".  Then do another search.  It should only be "video games" included in that new search and all future searches.

This is live in the wishlist now.  

Sorry for any problem.  Category filters should be retained across searches and across visits.  Can you please give me an example search that is causing this?  I will look into it ASAP.

You can give me the exact search phrase or the entire url for the search result page.

These are not official Pokemon sets.  We let users add the cards to the database and track them, but we do not add those cards at this time.  Sorry.

You can sort your collection by Grading Recommendation and that will be the Ungraded cards with the biggest grading profit potential based on their PSA 10 values.

Just choose that sort by option in your collection page and you should see results just like you wanted.