Not sure who exactly swapped your keyboard for you but you need to re-check your or their work.
Some laptop keyboards require screws be removed from the underside of the laptop and the size of these screws is critical (length).
A screw that is too short when it was intended to complete a ground can be a problem
AND
Of course a screw that is too long could cause damage by shorting something that it shouldn't or by penetrating a wire or pcb, so.....
Double check everything without knowing exactly what the job entails, I'm just guessing.  Maybe look more closely for another tiny ribbon cable, antennae cable or something that may have become dislodged in the process.