Currently, when you change the group a review belongs in, all fields of the review will be reset. This behavior causes problems when we have a review creator who put the review in the wrong group. Moving to the correct group would destroy the review by erasing all your review information. http://codecollaborator.smartbear.com/docs/manual/11.0/index.html?admin_groups.html
I'm not quite sure why this is done when groups are changed, especially when the Template is remaining the same.
I would ask that changing the group NOT erase all the review data...