This is most prevalent in "Total Patch" mods (like Smoke Patch, PES Professionals, or classic patches) where classic players are added. The patch creators assign IDs that conflict with the hardcoded default list.
However, if you are an avid modder or play Superpatch, Firebird, or custom Option Files, you have likely run into the infamous . pes 6 preset face list fix
By switching the status to "Build," you tell the game engine to stop looking at its internal (and often broken) preset list and instead prioritize the external files provided by Kitserver. Step 3: Clearing the Face Cache This is most prevalent in "Total Patch" mods