I have the same problem. I think there is an error in WooCommerce. My Variation tab has no place for price and shows the products as out-of-stock. Stuck now unable to update my products. This forum has yielded no help and I am not sure how to get to the WooCommerce development group to get this addressed.
I am at a loss of what to try next. It seems that WooCommerce is over-writing my the price and stock status when it is saved as a variable product. Is there a way I can update the stock status and price of my products at the database level so I can move on?