Yes I have had males locks multiple times, obviously one of the male was thought to be a female (bought it from someone I knew and never sex it).
Since I saw the same pair lock multiple times I never thought there was an issue, it's only when I paired the "female" to another male and they started to fight, that I knew something was up, I sex the "female" and found out "she" was a he.
That day I learned that animals should always be sex upon arrival no matter who they are coming from (Mistake do happen)
If you have doubt regarding the sex of one of your animal you should obviously sex the animal in question and have it double check if you are unsure and obviously if it is indeed a male stop pairing it with a male.