Hello, I have a refurbed 4948 that I configured, I upgraded the IOS from 12 to 15.0, and I noticed it still has acl entries in it from the old owner, so I tried to remove them, by going on config mode and removing them but somehow when I go to type sh access-list, they all show up again, the commands don't stick somehow.

  I tried setting up a test acl, and was able to remove that, but the old ones are somehow stuck, it's not affecting any of my current configs since the ip's are not the same on the acl and my lan. Any ideas or pointers, thanks in advanced.