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Images not streched in grid/column

Hello Community
I am creating a grid or a column and want to populate these with images.
However, the images are not stretched 100% of the grid cell or column.
What cause this? How can I fix it?
In the photos below, the blue line shows there is a white space for some photos. The arrows show where the white space is.

GRID

COLUMNS

NAVIGATOR

Cheers!


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