Gaps between tiles

Hey people,
I know there are plenty questions regarding tiles and gaps already, but my issue is a bit different: I created a new TilePalette and dragged a spritesheet (Grid by cell size 16x16; 32 ppu) into it. Within the TilePalette, it looks fine (screenshot 1), but when I want to paint with a selection from the Palette on the Grid, there are huge gaps between the tiles (screenshot 3). Any idea how to fix this?
Thanks!
178372-2.png
178373-3.png

Ok I got a solution, though I dont think its the most practical one: After I painted with the selection of tiles in the scene, I had to ==> click the selection tool from the Tile Palette ==> select the tiles in the scene ==> Go to the inspector the Tilemap I was painting in ==> change the scale of the selected tiles so they would fill the whole cell.