Heya, there is one possible issue that may be messing up data changes up for you:
- Uncheck the Automatically Add Multiplayer Data box in Map -> Map Options
(if it is not in there, just look somewhere around there, you should find it soon)
Although I'm not too well versed with extension mods, but as far as I'm concerned, extension mods should overwrite existing data in a melee map, so I cannot help anymore than this, sorry.
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