I made an little mess, and removed the folder with my files from the Media Pool and then readded it.
Now, somehow, the clips in my timeline have linked to different files. For example, if initially my clip was taken from file DJI_012, now the same clip with all same properties (e.g. crop) and duration is linked to the file DJI_029.
I am in Da Vinci Resolve 20. Anyone knows how I can solve the situation?