It looks to me like it’s a way to make the cap as weak as possible. It has two shingles thickness of dead airspace under a single layer of shingle. Could there possibly be a good reason to do this or could it be an unethical way to get some easy repair work down the road?
Also, there are two separate caps and the west end is two layers short compared to the east end. It was late in the day in December and was just starting to rain when they finished so I imagine that is why they short-shingled me due to time considerations. What do you think?
You can see a notch that’s been knocked out of the east end and there are several holes you can put your finger through.