Google sales channel not saving product values

My products are approved for Google sales channel, but no matter how many times I enter the values (age group, color, gender, etc) they keep coming up with missing value message. Products continually get un-published from Google even after entering the missing values and saving changes repeatedly. I am having to go back daily and re-enter the information, and when the window pops up to view the product and edit the values, the correct information is all there. All are custom products. I am losing my mind having to keep doing this over and over.