Hello.

I have a problem. Do you see the dark "highlight" almost black on the edge of the red petals?  Looks like a postwork went very wrong but this is an original capture. What cause it and how can I avoid it?

Set up is: 2 cold white light either side, the righside of lamp a bit far away then a left.
                  F/9
                  1/20 sec
                  iso 100      

I used different WB all picture  has it  this difault.    

Any help please...thank you