I clicked on "boxing" for fun and a bunch of results came up. The left side filters work well, but I have a question. Why can someone click on beginner, inter

I clicked on "boxing" for fun and a bunch of results came up. The left side filters work well, but I have a question. Why can someone click on beginner, intermediate and advanced at the same time? Doesn't seem to make sense to me. I think it should be a radio button, not check boxes. Edit: Two more things. 1) A personal pet peeve, please have the "Remember Me" default unchecked. 2) For some activities, the gender is important. E.g. for some kinds of dance, you need to parter with someone of the opposite sex. For other activities, some people might want to partner with someone of the same sex (e.g. self defense). I know having a gender indicator can be abused... but any kind of meetup site will run this risk.