Just wanted to ask if devs are aware, and is there a specific reason for why, mobs are double listed for spawning?

Using a dump utility, it seems that virtually every one of the mods mobs is double listed for spawning, making their default weight 20 instead of just 10.

I did do a search, and didn't get any hits for the search to see if this has already been addressed or explained.

Thanks for the replies in advance.

BiomeMobWeight.ods

BiomeMobWeight.txt