I had some issues with my mount and an Arduino myself. The EQ Mount and the Focuser try to connect via /dev/ttyUSB* and employ some auto probing if that fails.
I don't know if that collides somehow.

I changed the Indi devices to not auto connect at startup. I also disabled the serial probing. (restarted Indi to make sure everything was idle)
After that I could connect the devices one by one. (I checked to get the device names/numbers correct)

A better way would be to make and use stable device entries with udev. hintshop.ludvig.co.nz/show/persistent-names-usb-serial-devices/

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