404 caused by popup section fixed to header

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Hi there,

I have an issue which I'm not capable of resolving. And with my close to 0 coding skills I need some help. 

I'm using the Shella theme for my shop https://prohemp.nl there is a feature in this theme which is popup screens (see second picture). And as the header is fixed to each page, it's

causing a 404 throughout my whole site (see first and last picture).