Your format specifies that the modid comes as the second argument in the description key enchantment.modid.name.desc, but when you display the "Added by: x" section, it is using the third argument, the enchantment name.

It does this for vanilla enchantments as well.

https://github.com/Darkhax-Minecraft/Enchantment-Descriptions/blob/master/src/main/java/net/darkhax/enchdesc/client/TooltipHandler.java#L116
Should be getNamespace

Whoops, thanks for the report.