Hi @newtrendsshop, first of all let me tell I used Google Translate to understand your message since I don’t speak German, hopefully I understood what you mean correctly. I will answer in English, but feel free to use a translation system to translate it to German if that’s easier for you.
You are reporting that the product price has changed its size after a recent update, correct? Could you let us know what was updated? If it was WC Blocks, from what version to what other version? It would also be helpful for us to know which blocks you are referring to.
I would suggest doing a conflict testing with your theme and other extensions you might have installed to verify there aren’t conflicting styles between them. You can read a step-by-step guide on how to do that here:
https://docs.woocommerce.com/document/woocommerce-self-service-guide/
Hope that helps!