Hi.
I'm not sure if this is a bug with the platform behavior but I think so.
When you press the right cursor the left sprite hits the wall and stops.
When you press left cursor the other sprite hits the wall and scales it through it.
I think that this behavior is not normal.
https://www.dropbox.com/s/7oh11y5zjsyhq1u/platformBehavior.capx?dl=0