I just played through Heretic E1 using Doomsday 1.9b6.7 and the jHRP dated 2009-07-03. E1 is supposed to have no weapons higher than the Claw, but I found several Firemaces lying around. The first one was in E1M3, near the yellow key. A hidden door opens when you grab the key, with a couple warriors behind it, and the Firemace was in that little room. I turned off the resource pack and tried again and the firemace wasn't there. Turned it back on and it was back.
Now I just started a new game and no firemace. Weird.
Does this sound familiar to anyone?