Amazon s3 ListAllMyBucket charge suddenly doubles the cost of our backup storage

we noticed that on the 3rd September our Amazon s3 backup storage suddenly doubled in price as we were suddenly being charged a ListAllMyBucket fee. is this normal? we have used s3 for a couple of years now and never had this before? has the cPanel backup system changed to invoke this function in the system and if so is there a way to stop it as its making our backups extremely expensive...