Yup. Ran into the same issue. The glow happens to be the eye(s) of the plumbot head used in the original design showing through the skin for whatever reason. The way around it that I found is when you create the plumbot, before turning it into a plumdroid, play around with the different heads. Atleast one, that I found, is set in a way that doesn't "bleed" through. This has to be the bot used to make the initial template btw, not the bot you intend to keep.
https://docs.google.com/document/d/...nkNBmC7yj4/edit
That is a screenshot of the only head I am 100% sure never shows through. At least for me it never does. Hope this helped.