Recently there have been a few different users pointing out the same strange behaviour in the EditProtectedHelper gadget, which uses Parsoid to parse pages, edit them, and save them again. The gadget is changing hex colours in users' signatures to RGB, along with edits to whitespace inside style properties (example). I think this is a Parsoid bug rather than a bug in the gadget, as it delegates all of its parsing to Parsoid rather than try and do it itself. See this section on the gadget's talk page for more examples and some discussion.