I just discovered this:
I have four throttles. Engines 2 & 3 are actually being independently controlled, however the lever animation in the cockpit has all three tied to Engine 1’s throttle motion. If I apply throttle to Engine’s 2 or 3 the levers do not move in the cockpit, but the engines are being given throttle, but they act really weird due to still being tied to Engine 1’s throttle. Basically, Throttle 1 still controls 1-3, but Throttle 2 & 3 are also trying to control 2 & 3 independently, but fighting their being tied to Throttle 1.
Engine 4’s throttle still controls 4-6 together.