The pad sensors complete the ground circuit necessary to enable the "brake wear" indicator on the dash. So what has happened is that the sensors have made contact with the disc surface.

Whatever you had to do to retrofit the sensors to the new pads has ultimately set the sensors too close to the disc. The sensors generally make contact with the disc when pad material is reduced to about 10-20% of new (I'm guessing here, as I can get 2-3K more use out of the pad when the indicator lights up).

You can disconnect the sensors and just go with "feel" until you get a replacement pad that accommodates the sensors. Pad wear can always be visually inspected via the caliper slots anyway.

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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car