Question Platform mess and disalbing sides of collider

I followed the this tutorial to get platforms spawn at random position as in doodle jump.(There shown in the Gamemanager)
As you can see sometimes my platforms just a messy bunch


and sometimes they spawn just right


In the video it seems like the second picture all the time. No messy platforms.
Is there possibility to fix it or does anyone know why its happening?


Second thing:

You can see my platform in the pics and they got a Edge Collider 2D and a Platform Effector 2D. It works fine, my player can jump from through from below and stand on top. But i want to stop the player from colliding with the left and right side of the platform.

These are the configurations:


I guess the collider is just a line but the player can still collide with sides. Is there that the player can also pass through the sides?