"Personal text" not sticking

Twice I've added something to the "personal text" line in my forum profile, only to have it disappear after a short period. Is someone or some program removing it? If so, could someone provide an explanation for why that action was taken? I have looked for but not found any obvious behavioral rules that I might have violated.

Thanks, Jim Remington

I looked at my profile. I don't see anything labeled "personal text". Can you be more specific?

Look under "Forum profile", just above "birthdate" (which I declined to enter). I've attached a screenshot. It is something like a signature but appears (for a short while) on the left side of a post, under my member name.