All I have is two guesses without seeing the gun.
1. The hammer spring center pin is installed backwards?
2. The transfer bar is hanging on something when it is going upwards? Check by cocking and pulling the trigger (unloaded gun of course) with gun pointed upwards, gun horizontal, and gun pointed downwards.
The gun will have to be taken down further to inspect for burrs, bad parts, or just send it back to Taurus.