#3 Because it was just a non-title match
There's a lot that I don't like about WWE's booking, honestly. One of their worst habits is that their champions tend to lose a lot when it comes to non-title matches, even on the television product.
You only need to look at the gauntlet match this week for verification of the theory that I have mentioned. Samoa Joe is the United States Champion and he is going to be in a big program with Rey Mysterio at WrestleMania 35, but they had him pinned by Kofi Kingston because it wasn't a match for the title, was it?
WWE tends to forget that people watching at home remember the wins and the losses, and begin to see their champions in a new light if they don't win as often. Daniel Bryan, too, gets pinned a lot more than he ideally should.
Let's hope that Sasha Banks and Bayley are booked to look stronger.