It seems that the Fire Gleeok head tile offsets have been defined incorrectly in the default template yet again!
The default value for misc 8 (the tile used for an attached head, as an offset from the E. Tile) is set to 156 again, and the default value for misc 9 (the tile used for a flying head, as an offset from the E. Tile) is yet again set to 216, making the fire gleeok use the head tiles for the normal gleeok, as seen in the second image.
I had to reset the value for misc 8 to 336 and the value for misc 9 to 396 to make the fire gleeok enemies use their specified head tiles on page 28 again.
In reference to this old bug report thread: http://www.armageddongames.net/forums//thread/100315/