Mismatch between Stunning Force description vs behavior

Stunning force’s description states the following:

"Creatures are pushed away from center of blast, stunned, and dealt crushing damage in up to 3 increments.
Damage increment: 1d3+(whatever)"

However, it only ever applies the damage once; “up to 3 increments” doesn’t appear to be implemented in the code at all as far as I can tell.