trail renderer shows above everything (Unity 2D sorting layer )

The trail renderer shows above everything including UI. It is attatched to a bullet prefab wich both have been assigned to the correct sorting layer. Only the trail shows above the UI regardless of the sorting layer the canvas is assigned to The canvas is in Screen Space - Camera and the z shows 90. In 3d view it shows behind the other objects and if I change the z position to be infront of the objects in play mode the trail shows behind UI, but I cant change the canvas z position in the scene.