You have to understand why it is happening on the site.
As you can see that on your site there is no content after the products, Like there is no footer or pre-footer content see the image: https://postimg.cc/N90TB8Hn on desktop it will work fine but on mobile, as you know there is a sticky bar that will appear when you scroll but you want to fix it so if there is no footer and pre-footer content and the bar will be fixed that’s why it appears above the content and the price, review of the product will not appear and causes this issue. You can add the content of the footer to solve your issue, or set the sticky bar behavior to default and remove your code by doing this your back-to-top issue will be resolved.
