Aspect Ratio is Wrong on Desktop but Fine on Mobile? (Broadcast Theme)

[OlimpiaJames]

For some reason my Shopify Store aspect ration on desktop is set to what it should be on mobile? On mobile, it looks normal but on desktop it's all smaller than it should be causing there to be white bars where there shouldn't be. 

It's locked currently but here is the link
https://olimpiajames.com/

If you go to that, you can see the white bar on the right hand side. On mobile, i tried doing view as desktop and it's literally a small little square on the top left. I didn't make any change's to it so I don't know how this happened? I also tried another version I had - and it did the same thing.