Customized image replaces all product images

I am using Fancy Product Designer with Woocommerce to customize prodcuts, allowing the customer do add some text. I have Porto theme, also bought from Envato Market.

After I customize my product and exit the customization window, the newly customized product image replaces all images of the product. If I click on any of them, all I see the is the customized image.

Is there any known solution for this bug, support says no but i see first discussion on this started 4 years ago, that's a long time.

Thanks for your help !