Altitude losses when taking off from hillside

[Romenfree]

I have had my P4 for about a week, where I am flying from the ground drops away into an open valley. After take off I fly out over the valley the altitude does not adjust and when I drop down into the valley the altitude shows a negative reading so in layman's term the drone is drawing a line across and measure height from that line.
My query is when it come to a stop mid air it loses almost 2 meters in altitude, I can watch the altitude countdown before it stabilises, is this anything to worry about?

 

[rockydog]

Altitude is always shown relative to your take off point, so the negative values are quite normal. The drop in altitude when you stop is a common problem for P4 owners....whether it's anything to worry about depends on what's underneath you when you stop! (It's also annoying from a filming point of view, as it shows up in your video and alters your framing).