Here is the xinput list-props while the second screen (AOC) is disconnected 
Here the touch works as expected

xinput list-props 11
Device 'Weida Hi-Tech CoolTouch® System':
        Device Enabled (169):   1
        Coordinate Transformation Matrix (171): 0.500000, 0.000000, 0.500000, 
0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000
        libinput Calibration Matrix (308):      1.000000, 0.000000, 0.000000, 
0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000
        libinput Calibration Matrix Default (309):      1.000000, 0.000000, 
0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000
        libinput Send Events Modes Available (291):     1, 0
        libinput Send Events Mode Enabled (292):        0, 0
        libinput Send Events Mode Enabled Default (293):        0, 0
        Device Node (294):      "/dev/input/event4"
        Device Product ID (295):        9589, 49920

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https://bugs.launchpad.net/bugs/1287341

Title:
  Touchscreen controls both screens in dual-monitor setup

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