Gobo Cue Change

I have a cue list where between cue A and cue B I change five VL770s from one gobo to another. When the cue changes three fixtures will change to the new gobo and then later in the 4s fade, the other two fixtures change to the new gobo. They are all on the same gobo and all changing to the same gobo but they don't all do it simultaneously. Is there something I am doing wrong in my programming that is causing this or is there something different I can do that will correct this problem? Any help you have would be appreciated.
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