My DEATHADDERv2 MINI Sensor not working

I cleaned/blew out the bottom of the mouse despite it being in perfect condition. The sensor doesn't work, the click does work, and the colorful lights do, but the sensors don't. The only exception is when I put a shiny piece of an object like a coin below the sensor, it moves. Why does it only move on shiny objects? TLDR: Laser sensor not working.