The fobs run on two different frequencies, one long range for remote start (so that works for you) and one near field. That's the fob presence detect that allows the doors to unlock via touch and the in-truck start. That's the one causing you trouble. It could be one of three things: fob issue (battery, transmit of freq, etc.), antennas in the truck picking up the near field signal, or interference.
You will get further, faster with the dealer if you can narrow things down before you take it in. You've already narrowed it down to the near field frequency.
Does your other fob do the same thing? If yes, then it's probably not your primary fob.
Does it do this everywhere? If yes, then it's probably not local interference.
You can google about the electronics tinkerer who created a blinking light in his house when the doorbell rang. It blocked fob starts in an entire neighborhood for some time before experts were called in to figure it out.