Interesting. I've never noticed it, but I usually don't use those anyway, so I probably wouldn't (I enter the text code instead of clicking on the icon).
Maybe it's a first-found-first-displayed type of thing. So if a portion of the database is busy and one image descriptor is found before another, the order gets switched. I dunno, just guessing. I do know that when the connection is slow or the server is stressed, first the text code fills the box, and then the images show up one at a time.
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