Altitude pre select not responding on occasion

In my case, I was preparing for landing at 4000ft at 170knts, 1’flaps. It was not heavy.

I may be wrong, are you saying if the plane is reaching your final altitude that you set then you change once again the altitude the plane will suddenly drop in the aggressive way?
Have you guys had this experiences? like soon will reach ur final altitude with -2000ft/m then will drop when you change the altitude.

No I’m saying that when I’m selecting my ALT the plane keeps on descending beyond the selected ALT.

Can you get a video of this happening?

I currently do not have a video but next time it happens I will definitely record it.

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