2014 Honda Odyssey Elite "remote start"

So I've only had this van for a few hours and I'm still messing around with stuff. This FOB doesn't have that circle button for remote start but when i walk up to the van with my keys it auto starts.. sometimes? Then shuts off when i open the door. I can't find any information in the owners manual and Google isn't my friend on this one. I'm new to this keyless thing.

So I've only had this van for a few hours and I'm still messing around with stuff. This FOB doesn't have that circle button for remote start but when i walk up to the van with my keys it auto starts.. sometimes? Then shuts off when i open the door. I can't find any information in the owners manual and Google isn't my friend on this one. I'm new to this keyless thing.