Hi DeaenGrey,
as ZOs implemented that "feature" to auto switch the input mode based on mouse&keyboard or gamepad clicks/keys/button press it most probably detects the chatPad as a keyboard and ths switches to keyboard mode.
Did you try to change the settings for this in vanilla game settings (where you set the gamepad mode eabled/disabled/automatic -> "Auto change input") to "Gamepad" fixed, and not "Automatic"?
Hope this works.
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