My Parakeet Is Acting Weird With His Leg

So the other day i noticed my parakeet has been keeping his right foot in his feathers where you can't see it. So then i took him out as i do all the time and looked at his leg. i noticed that one of his back finger things was on the front of the perch and his nail was curving up.... but if i gently put his talon right way up it looked fine .

Is this a concern or is it normal? because his finger only bends sometimes. i couldn't get a picture but he puffs up and ides his leg and its always his right leg.