Store vanishes when loading and top bar is cut off by header

I added my spreadshirt to the site and followed a tutorial video from the spreadstore youtube. Most of the time when i load the page the store vanishes. Sometimes if i load it and touch nothing it works but other times it just squishes and goes away to make the page just header and footer.

Also side note the top bar of my shop that shows my socials etc is cut off.

The page I need help with: [log in to see the link]