True, we had that on our Ken Rogers Tandem Trike (bloody unreliable beast that it was) and twas the same on that, I think it is the WTFIT kicking in.
I cannot remember if twas Richerd Ballantine or the late great Sheldon Brown who had the theory that most vehicles are driven on autu pilot 95% of the time and when the brain (partly slumbering) sees this sort of thing it goes "WTFIT" and gives an over the top reaction of super wide birth, as long as it works eh ?