Do a visual inspection of the touch breakout board for some sort of short cut. Give connecting the onboard LED a shot... connect the SJ1 solder pads. If the LED is constantly on, then something in the input circuit is messed up or the whole thing is in lala land.
Usually, software is the primary issue... but here, I feel safe to say: it is the hw... since you tested w/ electro mechanical switch and validated your software.
Can you pub a focused, really close-up shot of the thing - for comparison w/ below one?
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