shader graph messes up the texture (2D)

i am trying to make a glow shader but. when i add that _MainTex property t$$anonymous$$s happens:- shaded

shaded wireframe

I tried changing the mesh type to full rect but when i do that t$$anonymous$$s happenfull rect mesh types :-

I don't know whats the problem plzz help , i am new to shader graph and i am using "sprite shader graph unlit" i also tried with but same problem . here's my shader graph :-shader Graph