Catagory block feature does not work

The catagory block feature doesn’t seem to be working. I can manually input a website address to block, and that works just fine, but no catagories I check with an x will work. I did notice that when I viewed info about a specific site, it had no catagory listing, and when I went to ‘dispute catagory’ it was listed as being a ‘catagory.null’ . This happens for every website I check.