Unsteady rotating mesh moment calculation #2622

I am currently performing a simulation of a rotor in edgewise flow with an unsteady SA solver. My domain looks like the following:

So an inner cylinder that creates the rotating motion of the rotor and an outside "bullet" from which I apply edgewise flow on the curved surface. My rotor spins around the negative z axis and to better understand the moments I attached a close up image.

I extract the moments in x,y and z from the history file and notice that one of my moments oscillates around 0. This shouldn't be the case. I dug a bit further and plotted the forces in x, y and z as well as each moment per blade.

This is where I found out that one of the hub moments is behaving weirdly. Instead of being dominated by the Fz (thrust) force which has the largest magnitude and largest moment arm, it follows the shape of its own force. I attached the graphs of the moments below and their forces.

The results in the picture are not fully converged but the moment do not change much and the issue persists.

Desktop (please complete the following information):

• OS: [e.g., Linux (UBUNTU 24.04 LTS)
• C++ compiler and version: [e.g., g++ (GCC) 4.8.5?]
• MPI implementation and version: [e.g., OpenMPI 3.0.0?]
• SU2 Version: [e.g., v8.3.0]