I had the same problem, and its pretty easy to solve, if you want to!
Inside your resourcepack folder, browse to "[1.6.2] R3D CRAFT Default Realism xxx(75%)/assets/minecraft/textures/blocks" (where xxx is the resolution of your version of r3dcraft), create a duplicate of "fire_layer_1.png.mcmeta" and rename it "furnace_front_on.png.mcmeta"
That file indicates how to use the texture, in this case by animate it
Thanks, it helps.Sometimes, all the textures get all buggy. It just randomly happens too. It's easy to fix, its just that no other texture pack does this. I'm using the 128x by the way.
The Meaning of Life, the Universe, and Everything.
You know, I really hate how some people will only give negative criticism on these things, don't listen to them, I've tested other texturepacks and none compare to this, I know for a fact that you have done more than overlaying translucent textures on the original, I can tell your too good for that just by looking at the pack, great job on combining the default look of minecraft with a more realistic feel, don't listen to them and keep up the great work, can't wait for the full version. Diamonds for you .