Number of articles in the One Page Checkout

If I add 2 or 3 article an change the numbre of one article in the checkout, the nubmbre will be changed by all articles in the checkout.
All articles have the same number in the checkout (Anzahl pro Artikel in der Bestellung). After reload the number is correct again.
thanks for your help

We have fixed the qty controls issue in the one page checkout and updated in our existing latest plugin package version 10.37 with this fix. Thank you