Steps to replicate:
Create a modpack with the following configuration

• fabric version 0.14.25
• zenith-1.0.1
• zenith_attributes-0.1.3
• fakerlib-0.1.0
• fabric-api-0.91.0
• Patchouli-1.20.1-84-FABRIC
  (basically only Zenith and it's dependencies)

Create a new world in creative
Place an enchantment table and surround it with regular bookshelfs so that Quanta is 15
Try enchanting some items (e.g. a sword or a pickaxe)

Sometimes you get all level 1 enchantments, sometimes you can get max-level enchantment on the first option.