I have noticed a few times flying into Canberra that the T-VASIS can indicate a 1 dot high approach and the other side show a 1 dot low at the same time. I now make that the challenge to see if I can keep both all the way down the approach.
Yes the T-VASIS on 17 is not great - I see the same thing - I think one side disappears completely eventually and the other remains?