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I have issues updating some products' price.

As you can see from the screen I tried to change the tax included price but from this page it only displays the changes on the price with tax ecluded. If I click on the product opening his own page on prestashop the changes disappear and in shows the old price values.

The only way I found out to solve it is to reimport the product forcing the id and changing the price with taxes or the cost price. Any solution? It only happens with some products

Edit: It seems that importing some products without any changes, but just the id and forcing it will automatically apply the changes I made on the price and fix the other ones.