Sprite behind semi transparent mesh

I'm creating a game with an editor which has multiple layers. Players have to solve tasks on separate layers. The first layer is the crane image in the background. The second layer is where the line is drawn. The grid has a semi-transparent background. When switching to another layer I move the grid to the next layer. You can see that the grid is not on top of the line, but the line is not affected by the semi-transparent background of the grid.

How can I solve that?

EDIT: Images seem to be not displayed second layer, third layer