Yes Wayne, it probably was because you were gone. My 2 did that only once, and it was when we were gone for an extended time (all on the bed )

It's a big move you are making and it will be stressful for the cats (and you)! They will recover in time, some quicker than others
I am also sure that you kitties know something big is going to happen..........cats always know!

Good Luck! Let us all know how it goes.