GuDGeoNaToR: The auto caddy sets the scale at 40 but it's a down hill put so I change the meter to 20. I putt & come up way short because the meter scale stayed at 40 even though I'm 100% sure that I changed it.
The meter appears to default back to what it originally was set (by auto caddie), even after you changed it, if you switch cameras after you set the meter scale. In your case, if you changed the meter from 40 to 20, and then switch to reverse cam to check line, if you switch back to regular view before putting, oftentimes the meter resets.
It has ruined many rounds for me as well. It is something I alluded to in a prior reply in this thread. Once YOU set the meter, WGT should not change it back!!! IMHO