F-14B engines at high cruise speeds

[CarbonFox]

I've noticed when coming off afterburner at higher altitude that the engines refuse to throttle back from near max mil thrust. In a clean configuration, I was actually holding a supercruising speed of Mach 1.4. I start descending and the throttle still doesn't respond and I eventually hear a clunk from my engines. I regain throttle control at about 14,000 feet. This seems to happen everytime and I just would like to know if this is normal for the GE F110s?

[Naquaii]

This is the mach lever in operation, it keeps the throttle at max dry until at a safe speed.