Phantom grey box that only shows up when I view on my phone

I implemented a toggle that shows different parts of my new blog on mobile.

Unfortunately, a phantom grey box shows up when I view it on my phone using chrome and safari, but doesn’t show up on the webflow preview or on the desktop code inspect.

How can I get rid of it?

Here is a screenshot from my phone’s browser. The strange box shows up when your scroll down. The toggle has to be flipped too :


Here is my site Read-Only:
https://preview.webflow.com/preview/jergarcia?utm_medium=preview_link&utm_source=designer&utm_content=jergarcia&preview=aeefe361fab25fefa9d67ccfbe6297a6&pageId=5fdb5cc8c55feb58f65397b8&mode=preview

I also have it live, which might be easier to view on mobile: jergarcia.com/things