Drone 360 rotation when Switching Gimbal Mode from Interpolate to Focus POI

[drwar]

My Flight Plan calls for Gimbal mode starting in Interpolate for two Waypoints and then Switching to Focus POI The headings are all 180 degrees, so no change in heading but after I pass the first Waypoint that is Focus POI the Drone does a very smooth 360 rotation into the next Waypoint. There is no heading change in the flight Plan. It doesn't do it at any other Waypoints

Can anyone tell me what is going on ?
Thanks

Jerry