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Hamburger menu doesn't open correctly on iPhone/Safari/ios only

Hey all!

I have a problem. I created a hamburger menu that doesn’t open correctly on iPhone only. As you can see on the images, it opens in a very weird way. I tested it also on a Huawei and a one+ and there it worked just fine. Also, it works fine in the phone view mode in the designer.
Public link: https://de-nieuwkomers.webflow.io/

Can anyone please help?

Thanks in advance.