Hi I just wired up my 50a home depot spa panel. Measured my voltage at the plug I installed and had 115v at each hot leg, good. But when I hit the "test" on the gfci I heard a pop and saw sparks fly inside the panel. The breaker remained on. The sparks spooked me so I shut everything off to see if this is a normal reaction or is something not right? It became a bit smelly too.