I've found that every now and then my data recording app will flip the values on me.
So, if you edit the display object by double clicking on it, then click "Open Script Editor", then click on the Background Script, you should see a line near the bottom that says:
Code:
LeftIsPositive = true;
or
Code:
LeftIsPositive = false;
You may need to change it from true to false or from false to true in order to get it to flip the values. Hopefully that works for you. If not, I can work on posting them with the values flipped tomorrow evening.