I am not an expert on those little birds.
Maybe thee want to mate?
Maybe they are cold?
Maybe they like each other?
How long has been going on?
Someone with more info should be along shortly.
I am sure you will get some better help than I can offer.
Not sure, but from experience, being puffed up all the time usually means theyre sick/not happy. If they are only puffed up when they preen, then it should be good. When theyre jumping around they should not be - at least they should not be all the time/ most of the time. Could mean theyre hurt. If it's only when theyre sitting with eachother I wouldn't worry, unless theyre always like it.
Closing thread due to age of original post. OP only has 1 post, being this one. If anyone needs help with the topic of "fluffed-up" parrots, please start a new post in the appropriate section ...