360 video export, Lock Direction not working?

Hi,

I need help or explanation.

I took some 360 video with my Insta One X camera.

I oppened them in Insta Studio 2020.

On the preview in basic settings I choose both flow stabilisation and lock direction.

On the preview image is stable and pointing in one direction as it is expected

I export file to mp4 format, H.264, max bixrate & original resolution.

When I open my exported file it is slowly rotating and direction is not locked. Is there any way to fix it ?

I really need it pointing in one direction for 30 sec.
Or maybe I am making some errors during export?

As I am about to process ~200 files working on mobile device is not a solution for me.
Will be glad for help!! :)