Multiple bus envelopes selected when time selecting in one bus

OK, I have messed up enough mixes with this one that I thought I would ask for some help.  Towards the end of mixing I usually start editing some bus envelopes in the track view.  I have noticed, too late many times, that if I time select (horizontal drag with the 'I' cursor showing in the desired bus track) in one bus the same time range in several other bus tracks are selected as well.  It is not all of them and none of the other buses were selected when I made the selection. I have even hit cntrl-A (deselect all) and then tried it but it gives the same results.
 
I can work around it by clicking on just the bus I want to edit after making the selection but I have accidentally adjusted the envelopes of several buses at a time by forgetting to select only the bus I want.
 
Any ideas?
 

OK, sorry, I wrote the shortcut down wrong. I was definitely doing "ctrl+shift+a". I even did select none through the edit menu.   Any thoughts besides that? 

Thanks for your help.  I will try some experiments when I get this current project done.  I will report back if I find anything.
 
Maybe i will include some screen captures to show what is going on.