Unable to save Link Post with Custom Post Type

Hi,

I am building a custom type called “Product”. I would like to link it to “Place” and another custom type called “Brand”.

I was able to configure it. However, every time I try to edit a Product, after I select the Place and the Brand I want in the dropdowns and click on “Update”, the screen refreshes but loses the Place and Brand I selected.

Any idea how this could have happened?

Thank you