Issues with colour bleed in After Effects animation
So I'm just venturing into simple animations for work and I've got something I'm pretty happy with but... I'm getting colour bleeding near the edges of objects from lower layers. 
As you can see here there's the white box underneath bleeding to the top and can be seen outlinging the pink. I've double checked position and size etc, they're identical (they are duplicated layers so that makes sense.)
Any idea what's casuing this or how to fix it?
