Sounds like you have 2 items with the same ID. Try asking one of the servers you can't join for a copy of their configs if you can. If you use the same configs, you should never have that issue.
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Biomes O' Plenty
Better Furnace
Better Storage
Vehicle api
Pokecycles
pixelmon
custom npc's
Anyone else experience this? Help! Also, I keep getting id mismatches when i try to join some servers.Thanks!