In DaVinci Resolve, my videos are played not clearly

In the DaVinci Resolve, my videos are played not clearly. Just like adding a white layer on the videos (I did not add any effect on the videos). But when I play my videos in these media players: Movies & TV, All Media Player, Any Player. They show clear video without a white layer on top.

The videos I recorded thru Samsung S21. The resolution is 3840x2160 and the frame rate is 30. And the version of DaVinci Resolve I am now using is 17.2.

Below are the screenshots from DaVinci Resolve, 'All Media Player' and 'Any Player'.

Screenshot in DaVinci Resolve

Screenshot 0_resized.png (933.96 KiB) Viewed 301 times

Screenshot in 'All Media Player'

Screenshot 1_resized.png (916.75 KiB) Viewed 301 times

Screenshot in 'Any Player'

Screenshot 2_resized.png (841.87 KiB) Viewed 301 times

Pls advise how to let the videos playing in DaVinci Resolve clearly. Thank you!

Ken