I imported sifz file to reuse in my animations. sifz file has distortion layers(scale and translate) in it.
If I place this imported object in one keyframe and change it in another keyframe, the first keyframe is also changed. How do I overcome this?
Hi, Happy New Year and welcome here 
Did you activate Animation Mode (little green guy) before to do modifications?
Happy new year to you too.
Yes I did. The same thing happens if I duplicate a skeleton layer.
When I make a change to one skeleton, the other one is also changed.
Ok, it is because of bones…
Sorry, this is still a buggy feature and it needs a lot of fixes, see https://github.com/synfig/synfig/issues?q=bones