In one particular case I answered a question, which already had an accepted answer but I felt my answer was more exactly addressing the OP's question. After a while my answer was voted 2nd highest. Subsequently another answer was edited, more or less copying my answer, which became voted 3rd highest. Later my answer was then also copied with slight variation into the accepted answer, making the three highest voted answers slight variations of the same content.
These edits were probably made with good intentions, but overall they lower the quality of the different answers seen together.