Probably something from Fast Forward Games (Entertainment). WoTC made Jim Ward pulp multiple titles because he couldn't grok the OGL.
It was a LONG time ago, I think it was a Necromancer Games module. One of their first dozen or so. And that at least was just a minor mistake; they didn't realize the SRD didn't contain shadow dragons, they were only in a FR supplement that was not part of the OGL.
Yeah, as I've looked at Jim's recent work over the last decade or so, I'm not impressed with it. When FF books first came out my brother got several of them and was shocked and dismayed at the incredibly poor quality of them.
It honestly feels, sometimes, like this fragment of the OSR community hasn't grasped that it isn't the late 70's anymore. Hire professional editors. Don't lift artwork from random sources, commission artists to do the work and give them the proper credit. And you can have an old school feel but still have a coherent rules system; telling people to just "make their own rules if it doesn't work for you" is lazy and unprofessional.