Bacon Kimono

It was -L$3 a couple of weeks ago and now it's gone down to -L$7. I don't have a premium account and I haven't bought or earned any lindens so my balance should be at L$0 right? EDIT: Ok, I just saw another thread which lead me to a transactions page. One of the groups I belong to has been taking money for Group Liability whatever that is. I should have checked more of the older posts first. Sorry to bother you.