The best way to report a bug in an add-in is to contact the add-in author directly. Andrew Clarke maintains a list of add-ins, along with links to their homepages here:
http://www.simple-talk.com/dotnet/.net-tools/using-.net-reflector-add-ins/
You should be able to contact add-in authors via the homepages for their add-ins. If the add-in is hosted on CodePlex, you can contact them directly via the CodePlex site. The .NET Reflector add-ins on CodePlex are all available via this page:
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