Always some borders between the Effect Mesh(WALLS_FACE,CEILING,FLOOR. etc)

Hi~

After I scanned my room with Quest 3, and I attached a default material to Effect Mesh(image above) in Unity3D , there will always have some borders with different width between the WALL_FACE,FLOOR and CEILING, I just can't  get rid of them,Why this happened all the time, How could I fix this?