I have purchased a left handed Caraloc 400 door lock for my trailer. The lock has been fitted correctly and locks okay using the key. The issue is that once the door is locked, I can not remove the key - by turning the key the other way again and pulling out - without the door unlocking itself. The original caraloc 400 it replaced allowed me to rotate the key and pull out without hearing a click and the door unlocking. I have purchased 3 of the same door locks and they are all unable to allow the removal of the key once locked without unlocking, Would appreciate if anybody knows if there is a setting in the lock I need to set. Any advice appreciated. Thanks