WordPress update

I recently started a new online store using the Mystile theme. Yesterday I only had 2 products. I updated to 4.0 today. My 2 products from yesterday do not display, but I am able to add new products without a problem. I tried to update the 2 products and it didn’t help. It’s not a problem as it’s only 2 products. I will delete them and add them again. I just thought this might be helpful feedback.