The problem with training a model in "Tune a Model"

I’m trying to train a neural network using “Tune a Model”. When I try to train the string “/hello [] []”, it is deleted on the word and it turns out: “/hello [”. The reason for this is that the tag turns into html code.

I just noticed that I can’t even write on your forum site “<”. I wrote “/hello [<text>] [<number>]”.