Did I damage this shower valve?
Is the leak at the faucet or the cartridge (handle)?
If the leak is at the faucet you may have shaken the seats loose or broke gunk in the pipe loose that got into the seats.
Both involve turning off the water and pulling the cartridge and looking for damage or debris.
If the leak is at the handle you may have cracked the plastic pivot / seal. With a new faucet they may replace it as long as there are no drill holes or gouges.