i just saw your project regarding customization issues and made s small test on your site.
That is normal behavious for customized fields.
When user saves customizations, they stay in the fields, but after he adds product to cart, all customizations are reset. However if you look at thecart page, you can see items with customized fields in there.
So I think you could just set up redirecting to shopping cart page after adding products.
This can be done in backoffice and you don't need to hire additional freelancers for tat.
Just wanted to share my thought with you :)