I have found some UI related issue attached like when I select element in widget, It selects all the elements and causing interruption many times. 

Can anyone facing such type of issue on MAC or help me ?

Hi this can be resolved by just clicking holding the CMD key on an element in the widget tree. And then just click somewhere else (other element). It makes the switch to just a single select, not multiple. I've ran into this issue before.
The same when you select an element, but the previous is still selected, this trick should solve your problem.

Happy new year ;-)