URGENT...4s lipo arcing or something on connection

Good day, I am currently building a qav400 and using a pixhawk. I soldered all 4 ESCs to the PCB and soldered the xt60 with positive and negative cable. I connected the motors to the ESCs.

To recap, the battery connector, motors and ESCs are soldered to the board.

I wanted to test motor direction using a spare receiver I have. When I connect the battery to the battery plug thats soldered to the board, I hear an audible crackle or pop that sounds like a spark or something is arching off. I did it a few time to ensure I wasn't imagining things. Upon investigating the pins in the connectors of battery and board connector, they look like they were sparking or something.

Please assist me.

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