Oh no! Here's what's happening.
The top section of the tap handle sits on top of the bottom portion. They marry together, and you push down to snap it into place.
When you pull the tap handle towards you to dispense the beer and then push the tap handle back to the upright position to stop pouring, the entire top section can lift off a little bit. When this happens, the two pieces get ever-so-slightly disconnected, and the top section doesn't push the bottom section closed, so the beer keeps flowing even though the top section, which has the tap handle is in the “closed” position.
The only way to fix this is to pull the tap handle back towards you into the pour position, push the top section back down to sit it back in place, and then push the handle back to the upright position, making sure the top section stays in its spot flush against the bottom section.
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