Help: Height Climbs with Demanded Sink

Hey all,

During a test flight we came across a moment where height was demanded to drop from 150 to 100m but instead climbed to 180m before being switched to manual. The demanded pitch was nearly +20 degrees as the throttle increased. The trimmed airspeed was set to 1300 cm/s and we were climbing while flying ~1100 cm/s. This confuses me since we should be able to pitch down and reach our trim speed. The climb rate seems to be too consistent to be a gust while we are pitched up.



This happened when SPDWEIGHT was set to 2, prior to that we never encountered anything like this. Logged flight data can be accessed here.

Any ideas as to why this would happen? I am at a bit of a roadblock with how to go about fixing this, any recommendations or advice would be greatly appreciated.

Thanks in advance!