When I search for "Folding blade" and blade length "0-3 in", I only get 7 results from your site. A similar search on BladeHQ gets me 12,000+ results.

I think you have too few knives labeled as folding -- I don't see any Spydercos or Kershaws that come back with the folding checkbox, and only a few CRKTs. A quick fix might be to hide the folding checkbox.