Gaps between tiles in a tileset

I have looked up a lot of answers for this, and I haven’t found anything. I am using Unity’s built in tile thing, and it’s all pretty great except for that the tiles will have these weird random gaps between them. I have it on point filter, made sure my splits are right, turned off mip maps and anti-aliasing, have the thing on clamp, and did literally everything and this still happens. Does anyone know how to make it so there aren’t these lines here? Thanks (Im using the Sunnyland asset pack while I’m messing around with tiles)

So now I’m at my computer.

In the attached picture I got following results

1.) If I place the red tile I got an white outline on three sides and an gray line on the right.

2.) If I place the red tile I got an white outline on every side.

3.) If I place the red tile I got an black outline on every side. (the red is my 16x16 tile and with the black oultine its 18X18.

120868-tiles-wo-border.png

What am I doing now is I take the third method and recolor the black outline with the color I got of the pixel next to it from my tile.

Here is a tile from me wich I repaint with this method :

120869-tile-test.png

When I place the tile on the left I get an black oultine around of it. (without the black outline my tile is 16x16 pixels)
To the right I got my tile repainted with the color of the pixel next to it and my tiles fit perfectly without any transparent or other outlines.

Sorry for the complicated method but I got no other solution for this. (if there is one please tell me)

If something is unclear just tell me and I’m trying to help you.