Wow that’s a new one! I guess the stringer didn’t know how to get rid of excess slack when tying off?
I think I’ve only had one really awful one, which was from a clubmate who always insists on getting a single string repaired whenever possible, despite what it could do to the playability of the racket or integrity of the frame. When I got it (after telling him a repair was not possible) I pulled out 8 knots from all around the frame!
Apart from the that the usual thing is badly crossed strings on the outside, there’s a JJS pic on here somewhere that had me scratching my head as to how someone could get it looking so bad!