XF 2.1 Opengraph image AWOL on Twitter

No idea then.

Presumably it's a glitch on Twitter's end - perhaps they are using cached data for your site and haven't updated it with the new metadata image?
 
That doesn't really make a lot of sense.

Mine is relative and works fine, as is this site.
Code:
styles/default/xenforo/xenforo-logo-og.png

Perhaps try dropping the leading /, depending on the image relative to the directory structure.
 
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