Discovered this on my afternoon ride. I have a 9 speed Shimano XT rear deraillieur with a Triple on front having the 27 speeds. Here's the problem I only have 4 gears that will work on the rear the 9th, 3rd, 2nd, and 1st. So instead of having 27 speeds, I only have 12. What is up with that? The cage is not broken and I can not find any bends.