Animation not recognizing small differences

Hey Guys, I've stumbled upon a problem just now.

I'm making a really simple "Aiming In" animation for my First Person Shooter, and I have to change the rotation of my camera a bit, but it's a really small amount. I have to animate it from rotation.x = 0 to rotation.x = 0.26, but it just won't animate. So I've tried something, and found out, that once a value changes by more than 0.5 it jumps to that value, but everything under a change of 0.5 won't be recognized.

Do any of you have an idea what that could be all about? Thanks in advance!