Unlocked flying and made some basic binds. Currently have just ascend and descend bound. Descend works fine, but the ascend button doesn't make me...ascend. If I'm stationary pressing the button it doesn't make me ascend. If I'm flying forward and at any angle of attack (positive or negative) it levels me out, but doesn't have me fly any higher.

I have bound this to several keys and this behavior follows the bind around. Am I misinterpreting what this bind is supposed to do or do I have a weird bug? I'm expecting that Ascend would increase my altitude either stationary or flying forward.