Go into your settings and see if the easy entry setting is on. If it is, turn it off.
Yeah, mine's a 2014 but it works the same way.
I'm tall so I have the seat all the way back (I set it as the #2 setting as my wife is supposed to drive it more than me). For her (short) she has the #1 position.
She noticed (and commented to me) one day that when she shuts the engine off the driver's seat moved to the rear all the way (to the #2 position which is the same as all the way back). She correctly assumed it was to make entry/exit easier for the driver.