Explosive vegging!! Blue mystic

Hey everyone, this is my first grow and I decided on blue mystic autoflower. I am on a 20-4 lighting schedule and am now 24 days in. My question is why is it so short and bushy??? There are leaves EVERYWHERE! I've never seen any pictures of plants this small and bushy before. She exploded and is vegging like crazy. Does Anyone know why this would happen? Any tips or comments? This is my first grow so please please comment!!!!

-Fox Farm Ocean Forrest soil
-1 five gallon pot
-257 cfl watts, (3 55 watt 2700K and 4 23 watt 5000K)
-fox farm grow big, big bloom, tiger bloom
-Mylar reflective lining