[2022] Weird damage scaling issue

Hello,

I have a question related to tooltip damage scaling. It is about Spirit Plague.

If I take a node giving +14% INCREASED damage (Unclosing wounds) I go from 2655 to 2712 (+57) tooltip damage. But if I take a node giving +25% MORE damage (Concentrated rot) I go from 2697 to 2712 (+15) tooltip damage. The only thing changing is the spread range (-15%) but it should not be taken into account, right?

So, is that a bug or something else? Obviously, more should give more dps than increased.

Thanks!