Hi,
To my knowledge. There is no such thing as a mid wing flap unless someone will prove me wrong , (I bet someone will).
This was most likely the speedbrakes or spoilers being deployed during flight to slow the aircraft down in the descent prior to landing.
Almost all commercial aircraft use speedbrakes as an effective method of disturbing the airflow above the wing thus creating more drag, this can sometimes cause ‘buffet’.
Spoilerons are the speedbrakes but with only some of the slats being used. These come out when the aircraft is making steep turns or when a sharp amount of bank is used. They act the same way as ailerons, causing the aircraft to roll.
You most likely saw the autopilot in action correcting it’s course due to the turbulence steering the aircraft of course. Hence the autopilot correcting it.
What stage of flight was you in?
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