Drop Amount not working

I created a mob based off of the Watcher from Divine rpg.
When I kill it, it drops the items, but only one.
Console:

7.05 07:15:43 [Server] INFO [MythicMobs] Found MythicItem NetheriteIngot, equipping to slot0 27.05 07:15:43 [Server] INFO [MythicMobs] Found MythicItem BluefireStone, equipping to slot0 27.05 07:15:43 [Server] INFO [MythicMobs] Found MythicItem DivineShard, equipping to slot0 27.05 07:15:43 [Server] INFO [MythicMobs] Calling MythicMobDeathEvent for The Watcher (loot:...

Drop Amount not working