What is the resistance of the coil?
Most likely you've melted the insulator.
What battery are you using?
Could be a hot leg, screws not tightened, coil too close to or touching deck, post or a lose center pin.
Disassemble the base / deck check for melted insulator.
Appears to be a fake,pseudo, hybrid / direct to battery contact style tube. Those should only be used with a delivery device with a protruding center pin.