joystick axis

[ghost]

Hello,
I use the linapple on my Retropie (raspberry pi 3b+ with an Ultimarc ipac2 keyboard encoder ).
Ipac2 interface is emulating / encoding arcade joysticks and buttons as two gamepads (Dinput mode).
If I test with jstest under retropie command line my joystick showing six axises but if iI move joystick there is physically onl three axises are existing= axises 2, 4 and 5 (axis 0, 1 and 3 not really existing).
I can edit nano /opt/retropie/configs/apple2/linapple.conf to change or remap buttons and the axises.
But if I change the joy0axis0 = 0 to the joy0axis0 = 4 and the joy0axis1 = 1 to the joy0axis1 = 5 nothing happens.
Maybe the linapple is not listening to the joystick which has more than 4 axises?
Because if I change the joy0axis0 = 0 to the joy0axis0 = 2 its working.
Is there any solution or hints how can I solve this issue?

Kind Regards
Niyazi