That’s strange. Maybe the GobiSerial driver is confused by the unexpected device layout? I don’t know this driver too well. You could make an attempt temporarily using the option driver, ref:
You’'ll obviously have to unload GobiSerial from memory first. I.e
rmmod GobiSerial
modprobe option
echo 1199 9091 > /sys/bus/usb-serial/drivers/option1/new_id
And connect to /dev/ttyUSB0