Why can’t I add this keyword? I don’t want to see Christian stuff

It’s keywords not hashtags. If you remove the hashtag part, does it change anything?

You may have hit the 100 word limit. They really need to expand it so we can block more crap content.

I've had this issue too. I've been blocking a lot of extremist hashtags but all of a sudden it no longer lets me add any. I have #advertisement blocked which I'm assuming is the issue because I think that's a glitch.