Copying lines in WDSC a little strange

 Hello all,

Although I am stuck on CODE Designer for the moment I am continuing my foray 
into WDSC by running thru editing source and I noticed something a little odd. 
I know I don't strictly need to do this anymore but I was copying lines using 
the old C and B and when I tried to copy a line three times putting B3 where I 
wanted them to go, it copied one line before and two after the line I wanted. I 
tried this a few times in case I had made a mistake. If I did A3 then the lines 
went where I wanted them, it is just the B, anyone else noticed this, or is 
this an intentional design feature?  

Steve the Apprentice