Category page not found

When editing a category you must edit the Category slug in the Shop Page before editing the Main Navigation. If you edit the Main Navigation first, you will need to add an ending / to the url and create a URL mapping to redirect /shop/p/category -> /shop/category.

For some reason, if you edit the Main Navigation first then change the category slug to the same url, SquareSpace will change the /shop/category to /shop/p/category which will result in a Page Not Found.