texture 1. ends at height 5000, it has two sub textures up to 4700 and 4900 respectively.
texture 2. starts at 4700, two sub textures at 5000 and 5100, they blend nicely between start and finish height.
adding another texture either stand alone, or as a sub texture for any of the others causes cell size blocks where there is no main texture and only some of the sub textures appear.
Can someone else do some testing to see if this is a bug or an error on my part somehow.
