Product availability fluctuates with each price recalculation

The product has a supplier selected, but the supplier's price and retail price are not indicated, while the In stock from supplier checkbox is active. [file]22083[/file] There is automation once an hour. Price recalculation. With each recalculation, the availability of goods changes: sometimes in stock, sometimes NOT in stock. [file]22083[/file] Why is this happening? [file]22083[/file] If you manually launch Price Recalculation, the product becomes NOT in stock. [file]22083[/file] If you manually run Availability Recalculation, the product becomes in stock. [file]22083[/file] [file]22083[/file]