G-sensor will not calibrate, says complete then bubbles jump back???

[digi]

For some reason, I cannot get my G-sensor to calibrate, and its off so bad that it turns opera to landscape if I barely even move it from straight up-down. Whenever I try to calibrate it, it shows the bubbles go level, it says complete, but then the bubbles go right back to where they were before. I've had this problem for a long time now with several different ROM's, searching didnt really find anything about this problem. I figured it may have had to do with using the new sensor sdk for manila 2.1, so I just flashed back to the stock Alltel shipped ROM and still have the same problem. If anyone could shine some light I would really appreciate it.