MOdeling problem in blender 3.0

i have problem in modeling why i am seeing edges on the right side of stall model. how to fix this issue . Pls help any onestall1.blend (881.3 KB)

It’s not clear what you mean and your Cube and Vert object are overlapping… the Vert object itself has overlapping geometry and some inverted normals also… and you have wireframe enabled in overlays…