After eviction,landlord files for past due included the rent, late fees, utility due until term of lease ends?

landlord has put an collection for rent past due and the payments due up to the term of the lease- 6 months including the late fees and water bill, the attorney representing the compnay states that landlord can get up to 6 months of rent after eviction. I was evicted in Jan 14, claims notices were sent, I did change of address, no notices sent except one to the person my mother who signed the lease agreement for me, with a total amount due of 7000.00 for the rent past due, including future rent, late fees and utilities.. How could this be?