You can only have 1 Product Detail module on the page. You can, however, have multiple Product Showcase to complete your Product Detail module on the same page to show related products, frequently bought together products, etc.

I hope this helps.

Not sure why but the product showcases don't work, when I add it to the page and try to use the custom product nothing shows up on the page after I add the Product ID. That's why I tried to add multiple Product Detail buttons. Accord cleared the cache on the site and restarted it but nothing worked. 

I think your theme is missing the Bootstrap javascript for the carousel to show up (but it actually works just hidden). I believe Accord is working on it since I thought I saw this being mentioned today :)

Thank you very much, I will follow up with them.