potion effects overriding everything.

[Chaogomu]

Playing a modpack with version 1.7.10-1.0.7.3 of the mod
Modpack name is "Farewell to Magic" version 2.6 as found on Curse.

The issue is that when any potion effect is applied to a player it's overridden with "Increased Luck".

Adjusting the configs to change the potion ID of Mining Luck to something other than -1 changes the overriding effect to "Golem Buffing"

Changing all potion IDs crashes the game, even under a new test world.

[Shahelion]

Usually -1 tries to set the ID to an unused one, but it rarely works. Try making a list of all potion IDs in your modpack in one place, to make sure none are in conflict. Also, post the crash report from the last test you did, if you still have it.