Ok, so...again, what is upsetting about it, especially if the cropped thumbnail is, in fact, a part of the whole image that it leads to?  Is it that you're not getting the whole image up front?  Do you not like lead-ins? 
I'm not saying that any change will come of it.  Frankly, I like making my thumbnails cropped images of the whole piece.  But, that is me.

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Knowledge is knowing a tomato is a fruit. Wisdom is not putting it into a fruit salad.