I'm losing my mind over this. Just got a Heybike Ranger with an included waterproof pannier bag. When attempting to install it, I found the pannier is so deep that the bottom slaps against the gears while in motion. Is that a bug or a feature? Am I just an idiot and there's some clever installation solution I'm seeing? The "instructions" provided in the pannier bag are of no practical value, and RV Enthusiast hasn't made a video on it. I'm stumped!