Meetups not working properly

This is new. There used to be some gap between myself and the other rider in my daily meetup.
Would have been nice for that gap to be a little tighter, but was fine.

Now, we are shoulder to shoulder, and we continually hop forward and back like two horses tied for the finish line.
In addition, very bizarre behavior with power. Going downhill at absolute full speed (top gear, 100rpm) I’m only going 22mph!!

What did you guys change?