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The Inertia Wheels use ultra high precision encoder. The software has been optimized to maintain absolute position throughout the signal chain. The limits set in the wheels are 100% repeatable down to 0.001° precision.
While the Inertia Wheels present precise coordinates, not all gimbals have a coordinate system capable of matching that level of precision. Many gimbals use accelerometers and gyros chips (called "IMUs") conventionally found in consumer electronics, like smartphones. With good algorithms, these IMUs can generate promising handheld stabilization and good responsive performance at the wheels. However, they lack repeatability. As the camera moves, the IMU subtly loose steps as they move. When you return to a limit, it is quite possible for it to be in a different position.
This is particularly pronounced in the Pan axis. Tilt and Roll Axis have gravity as a reference point. Pan has no such reference. Using heading assist features in the gimbal may help, but each feature comes with a tradeoff that should be understood by the technician.
Additionally, rapid changes in acceleration particularly challenge the IMU. Whip pans in particular are a very difficult for a gimbal with consumer level IMUs.