Blackmagic Forum

The image are not related to the project I'm working on, it's just to demonstrate the problem as an example with random image.

It's simple to try, connect a merge node to a lens flare (I don't remember the name of this one, but the same thing happens with others)

As you can see, on the Fusion page, it looks good, going back on the edit page, it looks like it makes a hole in the top "layer" (it's more pronounced in my "real" project)

I found a solution, but the problem still remain, because it looks how it should in fusion by default, but going on the edit page there is this weird alpha going on.

So my solution was to deactivated the alpha channel on the lens flare node, I found that by chance, clicking around.