orsm has anti-hotlinking code. When you viewed it directly, you were kinda viewing it at orsm, so you are viewing it in a non-hotlinked way.
When you viewed it, your browser cached it, ie, made a local copy.
Then, when you returned to this page, your browser noticed that you requested the same image at the same address you looked at it, and displayed the cached copy.
It's the same thing that keeps the tip mug image from updating until you hit Refresh.
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