Clean Video Feed in Fusion

I love the clean video feed on my 2nd monitor and it works great, except in Fusion. If i am in the Fusion tab the clean video feed sometimes looks kinda dark. Like its multiplied with itself (composing mode wise). Its not always and i could not figure out when it happen and why. If that happen its only in Fusion. When i go to the edit tab and watch the same fusion clip it looks just normal.

Any ideas or hints? Does someone else has those issues?

Thanks

Thomas