Your units_32 files is probably not indexed correctly.
see example units_32.pcx image and the units_32.pcx Game palette.
Your Images should be pasted onto the units_32.pcx file and keep the Original Palette. The Magenta color is the Transparent color and you need to maintain the same Game palette indexes for all colors. So as Pounder said, after you work on your images and are ready to place them, Just copy and paste them onto the units_32.pcx file and apply the Original Palette so you keep it the same.
see example units_32.pcx image and the units_32.pcx Game palette.
Your Images should be pasted onto the units_32.pcx file and keep the Original Palette. The Magenta color is the Transparent color and you need to maintain the same Game palette indexes for all colors. So as Pounder said, after you work on your images and are ready to place them, Just copy and paste them onto the units_32.pcx file and apply the Original Palette so you keep it the same.