Descending on AUTO flight mode

Hi there! I have a constant problem with my fixed plane. I take off on stabilize mode and when i switch to auto the plane is descending for a few seconds and then ascend to the selected altitude. Unforunately i can not upload the log file but i have done many flights and is always the same.
I am using Orange Cube+, Here 4 or Here 3, i don’t use airspeed sensor.
I also experienced the same issue with 4.3.1 and 4.4.4.
Below you can see a screenshot of the logs in exact time that i do the switch to auto, is this normal?
If you can help me in which direction to search.
Thank you for your time.

It’s going to be really hard to offer anything useful without a lot.

If it’s a file size issue, use a share service like dropbox, or google, or proton, or whatever.

If it’s a data issue you can use the Anon Log feature in Mission Planner.
https://ardupilot.org/planner/docs/mission-planner-initial-setup.html#advanced

Ok, i just upload the tlog to wetransfer, below is the link.

Thank you!

You’ll need to post a .bin log file from the plane. The .tlog isn’t much help.

This log only shows flight in Manual and Auto mode. (and RTL, but there doesn’t appear to be any flight in that mode).

Have you done the FBWA stabilization checks on the ground?

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