copy & paste an object

Copy and paste seem to be a little tricky in NX.

 

When I try to copy paste a feature, it works fine and gives a single copy of the feature.

 

When I try to copy & paste a simple object, NX does not give a copy of the simple object as expected, but gives copies of the original feature and its parents, as shown in pictures below.

 

Do I miss something about the commands?

 

Thanks!