That's not what the barometric height data shows.
I explained back in post #27 ...
although the barometric height continues to show around numbers around 30 ft, the VPS height shows changing height above the water from 20 ft to 10 ft, 14 ft, 19 ft ... then 17, 14, 9, 8, 7, 5 .... kerplunk.
Your drone was maintaining height, but the water was coming up from below it.
You were flying too close to the water's surface to be safe from the wave action.
You were too far away to see how close your drone was to the water/waves.
The incident was caused by careless flying in the wave danger zone.