Tile Gap issue in TileMap

I’m new to unity and I was just placing down tree sprites when I noticed a gap between the lower half of the tree and upper half, I’ve tried changing the pivot to custom in sprite editor but it hasn’t solved the issue. Please help, I also don’t know why this only applies to only two of the three trees there either.

These gaps are common in tiled graphics if the objects in question don’t align to exact pixel coordinates. Most commonly seen when zooming or panning.

I believe the Pixel Perfect package helps fix this. Also built-in tilemap solution should not have this issue.