WordPress 4.9.3 update created issues with variations

All the variable products that had on woocommerce, after the update they turned into any value and even if i try to change them by hand and save them again, after save they still get back to any value.

This is very important. I noticed on 3 eshop, with different templates, and plugin combinations.

I tried woocommerce 3.2.6, 3,3 and 3.3.1 and still nothing works!!!

Please help