Re-ordering ‘Graphic>InvertImage’ behaviours in ‘Manage Action Sets’ screen

Dear IB Team - sometimes the Builder will not let me move ‘Graphic>InvertImage’ behaviours up/down the list in the ‘Manage Action Sets’ screen (it’s as if the Builder is imposing some sort of hierarchy in which ‘InvertImage’ can not be higher up the hierarchy than ‘Animate’ in a parent/child chain.

I also find that sometimes i can not use the left/right arrow on ‘InvertImage’ behaviours (to, say, change from child to grandchild status) in the ‘Manage Action Sets’ screen if a 'Target' has not yet been assigned to the InvertImage behaviour, however that seems an understandable security feature.
I am using IB version 3.3.3 Build 325
Cheers.