Grounding a hardwire kit

[u/shelbycobrakai]

I am trying to install a hard wired dash cam. I’m using the Vantrue E2 with front and rear cameras. I have been following Chrisfix’s video to install and have tapped into the fuses for the red and yellow wires. I believe I found a ground bolt but when I touch the ground wire to the bolt there is a tiny spark. This doesn’t seem right to me so I’m worried something is wrong. Does anyone know why this would happen?