Slashable and Pickupable tiles?

[HolySheepy]

Hi,

does anyone know why some tiles can be slashes or picked up?
The things are randomly placed on the tileset.
It's a custom-style tileset

[LoneAngelIbesu]

To my knowledge, swamp tiles are slash-able; bushes and rocks can be lifted. Make sure that if you're using a custom tileset-- that's not simply a recolor of pics1-- that you're not drawing over the swap, bush, or rock tiles.