Line Item Quantitys change after pressing checkout button

Shopify Partner
10 2 1

Hello, we are using the  Shopify Dawn Theme. The dynamic rendering of updated Items works completely fine and shows correctly like it should. But theres some issue. When i press the Checkout button the quantites of 2 items are always switched. To Check this i fetched the cart.js before and after pressing the checkout button. And getting following results.


Does Somebody know what could cause this issue?

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