you can't assemble objects on middle layer in editor (you have "Middle Image" selected there in the drop down menu), works in editor but not in game as you found out
you should build them on front layer only (select Front Image in that drop down menu)
only tiles (ie not 'tile strips' from objects) can be optionally placed on middle layer (for building reusable ground features (objects) such as the 'sand vortex' you have there) and those then show correctly in game