I am still getting the same problem of connecting the wires, Then what I do is to restart my laptop or copy paste the design to anew layout. but why this is happening I do not know, I downloaded many a times the latest version still the same problem exits. though I have the solution to this (I mentioned in the above line) but doing so again and again leads to frustration. this problem occurs in the case where I make a subsystem as I mentioned in previous comments. So I want to know the cause of this problem and how to get rid of it.
Regards