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