I went in and changed the duration of my Friday workouts. After doing that my calendar was a mess. This is the second time this has happened. The first time I just fixed it. This time I sent a request into support. I should have done that the first time, but thought it was a fluke.
I’ll update this post when I have more info/feedback from support.
Hey @BrianSpang,
I just replied to your support ticket. 
It looks like there have been quite a few changes made to your plan and things got slightly off track somewhere.
We’ll get this sorted out for you! 
We got everything all sorted out for you @BrianSpang! 
Thanks Eddie, I appreciate the great support! For other users, I don’t think I’m out of line in saying that problems can occur when modifying a plan. I made a few minor changes to my plan since creating it in Nov 23 – a total of 4 changes, spread out over 5 months. Then something became unstable or buggy.
I’m happy my “plan life” is back in order. Thanks again.