This is a sign that something is wrong with your setup, and could be potentially dangerous to you and others around you.
Do not use your mod unless you are convinced that you or someone else have solved the problem.
In a mechanical mod, hard shorts can cause a battery to go into thermal runaway. The battery becomes extremely hot, vents hot gas, and depending upon the battery chemistry can actually explode or cause the mod to explode.
What's left of an exploded mechanical mod
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