Having trouble with One Key Return on my F181C Holy Stone

[TECH5960]

Hi All,
I read your article on the One Key Return feature and i would like to ask you a question about my Drone and it's Holy Stone and its RTH feature?
I have a Holy Stone F181C  and when i press the RTH or One Key Return Button the Drone fly's away from me to about 150' or so and i have to call it back manually.I contacted Holy stone and they  said that my drone will only fly to where it was "Bound" to instead of where the remote controller is located.The manual says to Bind.Calibrate the drone with the head facing away from me and i should stay still.I have done this numerous times to no avail and the drone keeps flying away from me to about 150'or so.Can you please explain to me what "Bound" means and also can you give me some advice on the best way to use this feature with my F181C.I really appreciate your time on helping me because i am at a loss as to what to do about making this feature work on my drone.Thank you so much for your time,TECH5960