Weird, that fixed it. I assumed that since the URL was exactly the same whether I ran it with ./nodebb start or ./nodebb dev, it couldn't be related to cache. I suppose I just don't know enough about how caches work.
Thanks anyways 😛
<meta property="og:image:url" content="http://community.nodebb.orghttp://community.nodebb.org/uploads/site-logo.png" />
This is not proper formatting.
Should be fixed now not sure why the site image had an absolute url.
I didn't know if this was intended or not, but I guess it was a bug.