I would really appreciate an answer to this as I've been trying to figure this out myself for the last three hours.
I want to post large images on my main page but the image size seems to be stuck on the size shown here
However, there is a no sidebar full width template that I've been using working as you can see here
Even when I fully copy my full width template onto my main page template, it's still stuck on that particular image size for my main page. I don't believe I have anything under css and this is pretty frustrating to figure out. Thanks a lot!