There are a lot of things you can do to mess up a mold.
1. The hinges.
2.Sprue plate
3.Sprue cutter too loose
4. Overheat a cheap mold(especially the aluminum ones)
5.Use the wrong cleaner
++++++++++++++

It is difficult to tell a mold is bad from a picture. You have to trust the seller. That is why I recommended the Cast Boolit web site. Tom.