So, my friend (the leader of our guild) is attempting to edit our guild's page, but there is a very strange glitch.

Using the word "not" turns into "-", as well as the words "and" and "or" disappearing completely. (It sort of looks like it's changing into operators, but why?)

is there a way to fix this?

Okay I'm pretty useless at helping people or they just don't heed my advice, but I think you should probably ask Cintrate, any other mods to help, or just wait for a different user to reply and see if they have the solution.
Or it's just a problem with his computer, still, I'm a noob at this so don't count on it.