Trouble after update to 3.0

Hello,

I did update to woocommerce 3.0 but after it the images did not show up so i did use my backup to revert it. After the backup i have still on some products the problem that the images are not showing up. Only on the older products the recent added products do not have this problem. How can i solve this?

My website is: https://www.naturalbars.nl