You'll have to check to see what other mixes you have involved. It's possible that the LINK function in this case will cause one or more of the other mixes to have a problem.

Since only one flap drops when you try to adjust the camber of the wing, you've got. It sounds like you're trying to set up a 4-servo wing, and don't have the flaps completely mixed in with the ailerons.

Use the instruction manual's setup first. Pages 54 and following go through the setup of a model with two aileron servos and two flap servos, and you set up ailerons, flaps, butterfly, aileron differential, aileron/flap mixing, flap/aileron mixing, and variable camber for launch and speed, in addition to regular flight.