Odd LPS inside out when moonlights came on

[14 foot reef]

I've had this bubble for 8 years I believe, it has really grown well and has always been a center piece in my tank. LAst night for the first time ever after the moon lights coming on, the bubble transformed into a very full, but almost inside out looking stage. Was wondering if anyone has ever seen this with a large LPS like this. Its about the size of a football or larger.
First pic is its normal look second pic is last night when the moonlights were on.

 

[Spare time]

Bubble corals are amazing. Plenty of lps turn into alien like creatures at night :)