On most of my tracks there is one set of aux sends and I add to them with the little + and find them with the up/down arrows.
On some I have two sets of sends, one above the other.
These are confusing as i don't know if I am duplicating sends or not.
What gives? is there a switch somewhere?

Are you referring to the Console View? In the track view you can see all of the sends by dragging the header down. I use an adapted screenset in the CV to show all of them. Set up video here and although that was in X1 most of it is still relevant, in fact easier with auto zoom.
 
Other than that two is the maximum in the CV at the moment, hoping that might change at some point and I can put my screenset to bed, although I might still use it as seeing all of them like that will eat up an awful lot of the CV anyway.

Thanks. Yes the CV.
It is X1 that I have.
Thanks for the video.
I never thought to use the track view for this.
 
What would be the way to change the number of sends in the CV?

You can add to the sends using the plus icon next to the sends module. Number visible at any one time is selectable from the CV options menu. Show as many as you like as long as it's no more than two.
 
In the CV use the scroll arrows toward the left of the sends module to scroll through them, if these are greyed out there are no more sends in the direction of the arrow. If they are displayed properly (i.e. not greyed out) there are more sends. The position number of the currently visible sends are indicated on them.
 
It's possible to display more at once by setting up a screenset like in the video I linked to in my earlier post. Using that it's quite possible to show 24+ but it is only on the in focus track.
 
 

Thanks Karl, it was the CV options menu.
Time to take time to explore all the menus I guess.
You get working with what you know after a while and stop exploring.