Recently, I have noticed that the backlight is a little inconsistent. The centre keys are very bright (6,7,y,u,h,b,n) and those immediately surrounding those keys (t,g,j,m) are quite well lit, with everything else being very dull (such as the 9,0,l,:,/ keys). I don't know if i have done anything to cause this. I never noticed this problem before. Is this normal or should I contact applecare about this and get it fixed?