Spike reps mainly occur due to the device coming off the mat.
- Ensure your mat is positioned correctly with the silver side facing up on an even surface. The device should be over the mat at all times even during the un-racking and re-racking stage. If your device comes off the mat you might see some inaccurate readings.
- Also make sure you’re not tilting the bar to one side as this can push the device off the mat (this would usually occur during un-racking and re-racking).