I've never understood why someone WOULDN'T reset the surfaces to the trim postions as soon as you're on the ground after that first flight.



Perhaps they are new and didn't realize what needed to be done, or their instructor neglected to point this out.
Another reason is they don't have a way to measure the trim deflection accurately.
Here are a couple of reasons why it "WOULDN'T" have been done as soon as the craft is landed.

Tom