TileList bulk image display / custom itemRenderer problem

I create a tilelist with a custom itemRenderer which will display image loaded with some text description, the source is from XML.
the image displayed correctly from 1 - 10 itemrenderer.
The problem happens on the itemrenderer 10+, the image is mismatch with the text description.
The worse thing is when I scroll the tilelist, the image change row by row that does not match with the text.
Why ? Any solution for this

Dear Alex
Many thanks for your hint. It did solve the problem
My orginal code make a dirty flag at commitProperties() that image load only once at first time. After your hint, I remove the loading code out and the problem has been solved. Thanks
However performance wise, the image blind and reload whenever I scoll the tilelist, how can I
a/ make the scrolling process more smoothly
b/ the image still in the screen ( no blind and off ) whenever I scroll the tilelist
Thanks and hope to hear your hint again

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