No sending costs for one article

-- url of the page with the problem -- : www.politikchronist.org
-- HikaShop version -- : 4.4.3
-- Joomla version -- : 3.9.27
-- PHP version -- : 7.4.20
-- Browser(s) name and version -- : Firefox 91.0.2 (64Bit)
-- Error-message(debug-mod must be tuned on) -- : Das Gesamtgewicht der Artikel ist zu klein um alle möglichen Versandmethoden anzuzeigen.

The article has a weight and a storage place. But when putting buying it, the error message occurs, that weight is to small to calculate the cost. I have changed weight from gram to kilogram and back, nothing changes. For other items everything works fine.

Solved the problem. The error was sitting in front of the computer. mixing up . and , ...