I'm not sure how to fix this. It's a "quick release" fixture, I guess so you can take the seat with you when you lock up the bike, but there's got to be a way to make it stay where I want it.
I might switch to the other bike for my next ride. Which means I have to find the tracker thing for it which has been traveling in my car with me for months waiting for me to buy it a new battery. But at least that seat stays where it should.
Cooling down, drinking water, eating second breakfast, and looking forward to *zumba* tomorrow night.