When setting up Auto Level on your HoverflyPRO, the trim you set will be saved in your radio, not on the HoverflyPRO. Therefore, it is important not to change the trim on your radio after you have powered down and disengaged the Auto Level feature.
Your radio will always be using this trim, but the HoverflyPRO will ignore this during normal flight. It will only use the trim when Auto Level is engaged.
For more about setting up Auto Level, please see: ( https://hoverflytech.zendesk.com/entries/21202158-auto-level-setup-for-hoverflypro )
Thanks to Dan Burroughs for providing this tip!