Not all products are exported to xml feed

Hello,

I have noticed that while in my store in the following category: https://aeliaspa.gr/%cf%80%cf%81%ce%bf%ce%b9%cf%8c%ce%bd%cf%84%ce% b1-galiniko/

I have 18 products.

In the xml feed that I reproduce so that my skroutz can see it, it only shows 12 of this category. For 2 of the 18 it makes sense not to show them because I have a filter to not show the sold out ones, but the other 4 I don’t know why it doesn’t show them in the xml. I have noticed that it doesn’t show me the products that have webP format in the image. Could you help me?

Follow the xml that I sent to Skroutz:

https://aeliaspa.gr/wp-content/uploads/woo-product-feed-pro/xml/8UpGcIexFMz9cVinGPsNnV4UhaDKNVyK.xml

The page I need help with: [log in to see the link]