Why is the caulk separating this bad after only a few months?

I painted this person's kitchen sometime this past summer (maybe June or so). The caulk on the crown molding was separating in some areas so I cut out ALL the caulk I could around the whole kitchen and recaulked all of it. I know colder weather can cause things to shift but this kind of separation is crazy after how recently I did it. Any ideas what's going on here?

The caulk separating is only happening on this side of the kitchen, no where else.