Multistore does not add offers to all stores

[TRESSET]

Good afternoon. I have a multistore with prestashop 1.7.1. I am importing products via CSV. Everything works fine except the product offers. The front office of the main store shows the original price and the reduced price, but in the other stores only shows the original price.

 

In the back office, inside a product page, I see that the offer is assigned only to the main store, and I must add the offer again for each of the stores.

 

Is there any solution for this? I want all stores to have the same price and offer. It would be great to be able to do it in one go.

 

Thank you very much! 

[TRESSET]

Well, it seems that this error only happens when I upload the offers through import files.

 

If I upload the offers through the back office, everything is going well.

 

It is not a solution, but I can continue working until I find a solution.