There is only one reason as to why the faucet is leaking from behind the handle. This is due to the graphite packing being worn out, and deteriorating over time. Over time the water will break down the packing, which will lead to the water leaking from behind the handle. The old packing once removed will be a dome shape. While the new replacement will not be a dome shape. The new packing will be squished into the dome shape as you tighten the packing nut.
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