Cross-Slide wrote:
The scopes are literally connected to points A and D.

No, no, NO. Two instruments connected to the same 2 points will not
give different readings just because you say that one of them is reading
the right-side voltage & the other is reading the left. Absurd on the
face of it!

Think about This mind experiment...
You have two resistors connected in a ring around a ( tree for the
sake of visualization) When you are looking at the south resistor, on
the south side of the tree, and current is flowing through the
resistor, The East point is Positive and the west point is negative.

Since the current is flowing around the ring..
As you look at the North resistor, on the north side of the tree, the
West point is positive, and the East point is negative. It HAS to be,
since the current is still flowing in the same direction..

We're not talking about polarity, but magnitude.

Bob