I think (because they are not labeled), that the shape button ..._434 is triggering this action? It is pausing before the objects that you want to show appear. I don't understand why you stagger them this since you want to show them by an advanced action that seems a bit weird. If you want to keep ti that way, you have to add Continue to the advanced action, so that the play head will continue beyond the pausing point of that button, after having gone through its inactive region, it will reach the start of the timelines of the three objects and they'll become visible. They will not get visible when the button is clicked, due to your staggering on the timeline. Then the playhead will again stop at the timeline of the upper most shape button.
I think it would be good first to try to understand the timeline: Tiny Timeline Tidbits - Captivate blog