Applies to: ZWCAD 2017; Classic; 2015
Because when create block, there will be a name for this block, and when you copy the block and paste it, the block name of the pasted block will not change.
The rule of block's refedit is to modify the block with specific name, so when editing one block, the other block with the same name will change accordingly.
You can not have two blocks with same name but with different shape, The method to make the second block not change accordingly is to explode it and build it by block command to set another name.