You are likely experiencing the bullet lodging into the grooves/lands especially since you have the slide locked up on extraction. My 45 Shield is sensitive to bullet position and bullet profile.
I am a reloader, however any new gun I purchase I buy a box of quality brand name factory ammo, if the new gun has issues with the factory ammo it is most likely the gun. If no issues I move on to my reloads but doing a plunk test prior to trying to use the reloads will tell you where you are at and where you need to be for bullet seating depth.

Extract that round and try out a box of quality factory ammo and see how that goes
The gun you mention is the next one on my radar in 5in for me!
Karl