As You can see everything looks ok until frame 360 - triangles are disappearing.
But after that frame there is a shape that dont dissapear and everything seems to be going on behind this shape.
I don’t see a frame number, I don’t see what looks ok and what doesn’t, I don’t see the shape that’s supposed to disappear and I don’t see what’s going on. Please describe what you want to do, where it goes sideways, add a frame number onto your sequence, and then hopefully we’ll be able to help !