2x Cropping on Panasonic G7 1080p, Why?

twgamerbuilder

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So Im not sure if this is normal but in shooting in 4k (video mode) its the correct focal length for filming but when i switch to any HD (1080p) format it doubles the focal length. I dont think this is normal. If anything people say that 4k crops in so why is it so opposite on my camera? (when it crops in my double it retains good image quality too which is odd) Thanks for any help!