No. it,s a stock Brand X. The starter is very similar to the minis, though.

It may be as John says, that the starter is not fitting correctly in the bell housing. If it's being forced out of alignment slightly when it's mounted it could put too much stress on the nose of the starter.

If it has too much opening, the torque of the starter may cause the pilot end of the snout to flex away from the ring gear and stress the housing in the opposite direction.

Either way could result in a fracture over time.