Problem between Manual / FBWA and LOITER / RTL

Problem between Manual / FBWA and LOITER / RTL.
AUTO_TRIMM = 0
In MANUAL and FBWA, the model (GLIDER) flies horizontally.
In LOITER and RTL, the model flies with an increased pitch angle
(stably at high speed downwards).
How can I get the model to fly in LOITER / RTL the same way it
does in MANUAL / FBWA?
I couldn’t find a parameter for this in the documentation!
Best regards

We will need a .bin log file.
I would suspect use of trim in the rc radio.

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