A search map problem

[temnix]

I was nearly done with my area when I realized that I had overlooked a few spots in corridors, making them impassable. Here and there terrain type also needed to be changed. I exported the search map from Near Infinity to a simple 16-color bitmap and proceeded to correct it. When I put the file back in override, I found that terrain types had been thrown off, and what used to be wood now sounded like water (shallow water, to be exact). I opened the area in DLTCEP and saw that the search map, all of the maps actually, have become garbled to this program. There is no actual problem with them inside the game, but DLTCEP shows the search map this way:

The error with terrain types I could perhaps fix myself by editing the pelette in the program. Somehow the colors had been moved around the place, and the turquoise that used to mean wood had been assigned to shallow water, hence the wrong footsteps I had heard. If I restored the meaning of the colors, I could probably get correct sounds to play. But I had to save the area afterwards, and saving it with the search map looking like it does here gave a predictable result. I don't really understand why the maps had been skewed so, maybe because I had recreated the tileset a bunch of times from a PNG, with corrections, since last checking the area out in DLTCEP. I only need this program for search map editing - everything else I do in Near Infinity. But there you are, DLTCEP is astigmatic about the map now, even though there is no problem in game, and I'm not going to save a garbled map. Recreating the map is not an option. Any ideas?