Prelit Tree Lights Out of Sync?

I have a 6ft tree in 3 parts. You can have either coloured or white lights. Last year all three sections were the same, but this year I cannot get all 3 sections to be the same, ie. all white or all multi coloured. The 3 sections plug into one main controller and no matter what order I plug them in they are never all the same.

By Jim