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Now, I'm not a java guy, so I'm coming at this one from right field.
But here is what I am thinking, whenever the list is updated, whatever selection they had before may or may not still be there, or may or not be in the same position, so it probably goes through a section of re-selecting the current selection, which fires off your event.
It seems like a pretty reasonable thing to do. Perhaps they selected the "Other..." option, and now you have populated the "Other..." choices some more...
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