It sounds to me like you are stuck in an active regen loop. With such a short drive, it is not able to complete before you are shutting the truck off. So it will start back up the next time you drive after the engine warms up. But if you shut it off again before it completes, the process repeats, and will continue repeating until it completes or throws a MIL requiring you to drive above 55mph for 45 min or more. My suggestion is to add some distance to you commute home to allow the regen to complete. You should notice a definite uptick in mpg to signify that it is done. Then go home.
This is correct. I found the exact same behaviour with my Titan. I had to drive my pickup for 32 miles to get rid of the regen.