Physiscs Colliosion is Messing Up

I have to collision objects. one movable and one immovable. The movable one always passes through my other immovable object. How can a movable object go through an immovable object? This has happened to me more than once. Kinda weird.

My immovable physics object has a custom movement action btw. Does that matter?

The custom movement is likely the cause. As a rule of thumb if you move an object with the physics behavior don't use any other movement behaviors on that object. With just the physics behavior collisions should behave correctly unless the objects are moving with a very high speed.

Custom movement behavior does not want to work with solid objects. I've tried making the objects solid and I've tried adding physics and making objects unmovable. (press space to gain speed)

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I'd appreciate your help, thx!