You must have hit the URL button again. This is your entire post:
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[url][URL=http://imgur.com/GVnbkyp][img]http://i.imgur.com/GVnbkypl.jpg[/img][/url][/url]
Think I'm getting close.
How does that look?
I mean the pic not the car.
I would guess this bit was supplied by imgur, and is all that is required:
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[URL=http://imgur.com/GVnbkyp][img]http://i.imgur.com/GVnbkypl.jpg[/img][/url]
Which gives:

So the extra
[url] at the start and
[/url] at the end were superfluous.
Also, if you don't want the image to contain a link back to imgur (so clicking on the image goes there), remove the
[URL=http://imgur.com/GVnbkyp] at the start, and
[/url] at the end, leaving just:
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[img]http://i.imgur.com/GVnbkypl.jpg[/img]
and a pic that looks the same, but can't be clicked on
