The shellholder on the ram, or the shellholder plate align the cases with the dies.
More likely, they have offset flash holes, contaminants in the flash holes, crimped primers and they’re slamming their press, or sloppy fitting shell holders which allows repetitive misalignment of the case to the die.
Ditching a decapping pin for fear of breaking a pin is non-sequitur. Some kind of decapping pin must be used, and the likelihood of damage doesn’t really get reduced simply by using a universal decapper.