Metal spring vibration noise when closing rear door

[motley]

Hi, just got my Ranger XLT last week. Everything's good so far. One thing I did notice is that when closing the rear passenger-side door, I notice a metal spring-like vibration buzzing noise coming from underneath the truck. It's very noticeable and I can confirm it's coming from underneath the truck. Does not seem to be electronic. I checked it on the other 3 doors but didn't hear it. Only the rear passenger one will make the noise when closing the door. Is something loose or not bolted on properly? Anyone have the same issue?

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