Both provided example pathing maps work perfectly. The 12x12 one loads correctly as 12x12. The 60x60 one also loads correctly as 60x60. Both show up correctly in the editor when pathing overlay is turned on. Both also work perfectly in game when used as a building pathing map, blocking construction and collision as expected for their shapes.
Something is wrong with how you are importing them.
How I imported them was to first import the appropriate tga file, for example "example 60x60.tga". I then changed its path and renamed it simply to "60x60Example.tga" (not in a folder although that really should not matter). I then saved the map, making sure there were no errors during save (if there are errors they could cause the import to fail). For testing a selected the default melee Orc Burrow unit and changed its pathing map to "60x60Example.tga". I then placed one of these on the map and turned on pathing view. The overlay correctly showed the 60x60 pathing area and shape as described by the file. I then placed a peon and tested the map to confirm this is the pathing in game, which it was.
