Sounds like the accessory relay is sticking in the "on" position.
The accessory relay is usually located behind the dashboard on most trucks. Its function is to energize all the circuits that are switched on & off with the key switch, thereby relieving the key switch itself of the high amp draw required. The key switch activates the accessory relay which turns on , supplying power to the dashboard instruments, computer, and whatever other accessories that are connected to it.
If the accessory relay sticks on, even when you turn the key off, everything will stay turned on.
And if the contacts inside the relay are getting bad, once it does shut off that could lead to problems getting it to turn back on also.
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If you can't shift it smoothly, you shouldn't be driving it.
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