Aspect Ratio Issue

With your clip selected, look at the Properties panel in Shotcut. Do the clip properties match 3840x2160? Maybe your camera is actually recording 4096 x 2160.

You need to either match your Video Mode to perfectly match your clip resolution, or you need to apply some aspect ratio conversion. The most common conversion is to crop the sides off the clips to make them fit. You can do this with the Size, Position and Rotate filter.

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