It is very odd I also see the same thing sometimes this past 3 weeks has seen every snake I have (11 permanent and 2 in 'rehab') shed the really odd thing is my bearded dragon is shedding too. Go figure.
I wonder (not the dragon) with the royals, if it is a pheromone thing they do pass pheromone from the fluid between the shed layers? Just a musing on my part!