Vertical ascent and elevation gain readouts on a treadmill.

Just trying to understand the difference between these.

I assume the vertical distance shown is effectively the altitude you've reached, so it takes into acount any descents etc.
I also assume that the elevation gain is the sum of all the inclined parts of the run.

However, on my 10k run with a mix of inclines and declines, my mill reads out elevation gain of 975m and a loss of -158m. The vertical height reads 417m. These figures don't quite make sense to me. Shouldn't the vertical height be the elevation gain less the loss?
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