Hello there... I ran into several 2019 D & P Innovation Dollars with "extra" edge lettering/Mint Marks and stars. Been coin collecting for many years and have never seen anything like this before.
Call it what you want. It looks like I've seen this before somewhere. I guess they never got it correct.
These run thru a roller dies or Castaing machine. If there is a problem, edge inscriptions will show twice or overlap themselves. The same thing happened on a few of the presidential dollars.