
Danik
That looks very odd. I suspect it happens because of the tile mappings though, they can be a bit counter intuitive. You can display the mapping by pressing Tab. When you paste, the tile mappings do not follow, so if you paste a grey part onto one of the mapped tiles, all instances of the tile will become gray. I plan to implement a way to more easily move chunks of tiles in the canvas, but for now you can use Document > Resize canvas, choose the bottom right pivot point and decrease the number of tiles in order to crop away rows or columns from the top/left of the canvas.
If something else is going on then it might be a bug. If so it would be great if you could provide me the steps to reproduce it and I will investigate.
If something else is going on then it might be a bug. If so it would be great if you could provide me the steps to reproduce it and I will investigate.