Pre-mult question

Hi, I have a composition in the Fusion tab of resolve. It is compositing fine when in that tab, when I return to the edit tab, or colour tab, it does not composite correctly. I've added some screens where i have overlayed the objects for reference. I've tried many different things to get it to composite correctly - ticking the premult/post divide in the nodes, different apply modes and operators in the merge nodes. Nothing really fixes the problem. What is it that i am doing wrong?