This may have already been reported but, sometimes when I do a search I get duplicate results. Here is one search I did resulting that way: Mage City
Not sure if it's related to the fact that I used quotes in the search string.
I didnt get any duplicates but I got less results than you did. Could not find Mage City 3D, the tileset, or the 2D Mage City. I dont know if they have that tag though, I imagine they do if theyre at least showing up in your search.
The bug is known long but the developer will not do much anymore on the code itself thats why it introduced the title search if you search with the title field you get proper results.