My guess is, if your bp spent alot of time in the 1st hide it might smell familiar or less plasticy than the newer smelling one. Which might be related to a sense of "safety" making him/her choose it first.
My little guy did the same thing when we brought in a new hide. he was forever in the 1st one. Now he uses both as needed.
id have to agree with this. your snake is probably just seeking comfort.