Welcome to the forum, @nexion21!
Firstly, just to clarify for other readers: the Non Local Means Denoise is part of the Biomedgroup update site.
I was able to reproduce the orangeification of the edges on my local machine by running the "Non-local Means Denoising" plugin on the image above.
Maybe @twagner has some insight into this phenomenon?
As a workaround, the problem does not occur if you first Split Channels, run the denoising on each of the R, G and B channels individually, and then Merge Channels again afterward.
(Unfortunately, there appears to be a bug if you Make Composite on the image and try running the denoising on that: