No, that is abnormal.
Was the unit powered off at the time? If not try when battery is unplugged.

I looked up the owners manual for your truck and it does have a lower switch. I have never tried using the emergency lower while the truck was requesting a lower command, there is a possibility you are correct and the lower switch is stuck causing the solenoid to remain engaged which may make the **** difficult to use this is why I'm now asking to try with no power connected.

If it is the same with no power, MY next step would be removing the valve and inspect/replace.
If you don't have experience with hydraulics you may want to hire someone who is. I wouldn't want to see anyone get hurt, there is potential for excess of 2500psi to be in the system.