Quoting Gaspath
The flaperons will also move down if the engine thrust is moved into the takeoff range (with flaps up!)
The flaperons do move around on take off as below.
Select take off flap, Flaperons move down.
Select take off thrust, the flaperons are disconnected electrically, and will float up, being pushed by the exhaust plume. They can be seen to flap up and down (Is this why they are called flaperons!) At 80kts the electrical signal is returned and they slowly move back down to the take off flap posn.
The reason behind this is to stop loads on the attach points from the engine exhaust when they are not required. The flaperon is in the direct line from the exhaust.