Why if there is 2 relation in the view, it does not work ?

I've created a "Like" flag for flagging the store and products and a Message Stack template to create a message when the store and products is created.

I want to create a view that displays the Message content that has been flagged by the current user.

Capture d’écran du 2019-04-28 00-04-03.png

Here is the configuration of my view :

(field_store_reference : Boutique) Flags

Capture d’écran du 2019-04-28 00-04-15.png

(field_product_reference : Produit) Flags

Capture d’écran du 2019-04-28 00-04-26.png

With this configuration, the view displays no results. Why ?

If I delete the Relationships :

(field_product_reference : Produit) Flags

The stores flagged by the user appear.

If I add the relationship :

(field_product_reference : Produit) Flags

There is no result.