Here's what I think..
Dual engine failure leads to flight on Batteries until RAT is deployed and AC power supplied. FAC 1 is not powered by batteries and therefore needs resetting to make it work again. (Re-boot!)
Resetting FAC 1 does not affect the aileron upfloat - the FAC does not control the ailerons - but it does regain rudder trim.
As you are in Alternate Law (roll direct) it is important to use the rudder trim if the a/c has a tendency to roll with stick neutral - there is no "normal" roll stability to keep the bank angle constant and no bank angle protection.
As to why the right aileron upfloats - don't know! The Green servojack will be in damping mode, the Blue in active mode, but the position of the aileron is still controlled by ELAC 1.
TP