Longswords from the Gobber mod has an attack range of 2.5 while all the other longswords have a range of 2.9. I am not sure if it is because I configured these attributes (I changed durability, minespeed, attackdamage, and enchantability),

//GOBBER
GOBBER(5, 1796, 8.5F, 5.5F, 13, () -> Ingredient.ofItems(Items.DIAMOND)),
GOBBER_NETHER(6, 2562, 11.0F, 5.5F, 16, () -> Ingredient.ofItems(Items.DIAMOND)),
GOBBER_END(7, 3916, 12.5F, 6.0F, 24, () -> Ingredient.ofItems(Items.DIAMOND));,

but the thing is all the other Gobber weapons have same attack range as the other weapons'. It's just the longswords that has the same attack range as normal sword.

Thanks for the report!
Looks like I missed the compat weapons when I adjusted the longsword range in the most recent update.
I'll have this fixed for the next release

Awesome!
As always, thanks for the amazing mod.