Garmin Fenix 5x Plus workout changed while running

Hello, I'm a Garmin newbie.  I setup a 2/1 interval workout, with the max number of repeats allowed, in Garmin Connect and loaded it to my watch.  This morning I started the workout and after one interval the watch changed the workout.  At first I didn't know what it was, I just know the intervals stopped.  Then after 1 mile, 3 minutes rest popped up.  And it continued on that 1 mile, 3 min rest interval the rest of the way.  I have no idea how this happened, I did not push any buttons, and I DO NOT have a workout like that on my watch or Garmin connect.

Any ideas on how this happened?  And how I can get my watch to stay on the workout I selected for my entire run?