[PHOTO] Photo help

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Anybody have any answers for this problem?  This is a picture of a really wide re-blooming plicata but it has this line down the side.  It has been happening on quite a few of our recent pictures.  I am pretty sure it has something to do with the flash but I am not positive.  Does anybody have any suggestions for this?  Much appreciated.

Thanks

Mike

BTW  this is really, really nice flower.