It was pain to read through your color coding but here it is visualized (six flames one letter):



"FM*" belongs to right part of the inner bottom flames, while the "AUR" is complete inner left flames. "THE" is to the left of the "FM*" inner bottom left, while "ISKEYFILE" is the whole right and top inner line of flames.

First that comes to mind is that these three leaves on the left are obscuring some invisible flames and are corrupting the message, and that we have to guess which flames are under the leaves, but that doesn't explain how "FM*" is corrupted and why that single leaf on the top line of flames is not messing the "ISKEYFILE".