conditions inserted into user data

Hi,

i've just had to do a server switch and i noticed the user mySQL table was quite large (as you'd expect i guess), so i looked at one of the user rows and noticed that the Terms and conditions were being inserted into the user data column.

I checked the hook_user for the module and it does $edit['legal_accept'] = NULL; so i don't understand why its being inserted??

will this cause any performance issues and how can it be stopped??

thanks
Tom