I have searched and cannot find the answer. Hoping someone can help. I ordered a bike from BD and the rear end is trying to change gears but only in 4th, 5th, 6th. 4th and 6th just clicks a little while 5th the chain is actually raising off the cassette. Shifts beautifully to all gears, everything seems to be lined up. Someone please help me, I'm loosing my mind thinking about this. Thank you in advance