Ender Drag, flying to spawn.

Hey guys, im trying to make a ender dragon in overworld; no matter how far I spawn him from spawn, he always flies straight to it. Any idea why?
ED:
Type: ENDER_DRAGON
Display: 'World Breaker'
Modules:
ThreatTable: true
BossBar:
Enabled: true
Title: '&dWorld Breaker'
Range: 150
Color: RED
Style: SEGMENTED_10
CreateFog: false
PlayMusic: true
Health: 200
Damage: 12
AIGoalSelectors:
- 0 clear
AITargetSelectors:
- 0 clear
- 1 players
Options:...

Ender Drag, flying to spawn.