The liner resting on the far left side of the tang is usually desirable, considering that it is assumed this contact will wear eventually with many years of use, and the liner will slip further to the right side of the tang, after awhile. Of course, if the liner just doesn't settle itself far enough on the tang, this could be a problem as well. Does the lock seem unsafe or weak to you? If so, why? Has it passed any spine-whack tests, to test it for liner locking and contact against the tang? If the lock is actually failing, the knife needs to go back.