Tileset split

I tried searching for this but could not really figure out what to call it other than showing a picture
My grid/tileset does this splitting thing every now and then(The thin white line crossing the water)
It also splits in random places as I walk around and collide with things but then covers itself back up again.
Im sure its been asked before and I apologise for starting a new thread but is there anyway to fix this problem

@GrindalfGames

You should do searches here - there are several answers to this kind of tile edge issues, and I’ve written at least 3 lately.