Marble slides problems

Hi !
I am trying to make this marble slides work but I don’t understand why sometimes the balls fall both sides but not always. It frustrates me!

Thank you

I believe the balls follow a bit of physics with a a little bit of randomness.

I seem to recall that @denis once mentioned that the viewport size or resolution could make a difference in some instances (which makes it very hard to verify reports of problems). The marbleslide physics make use of an external tool (box2d?) that sometimes doesn’t play as nicely as we would like. You are not alone in feeling frustrated about inconsistent behavior. Thankfully, the glitches are fairly rare.