There have been reports of the iPhone 5s motion sensors showing incorrect values — one particular MacRumors thread goes on for 20 pages — and today Gizmodo demonstrated that the sensors are off when compared to a level. The report found the gyroscope was a few degrees off, and that the compass on the iPhone 5 had a “more accurate measurement” compared to the 5s. In confirming the findings, we found similar issues when testing the iPhone…