Random Bonus attribute point post lvl 50?

I've been 50 for a little while now, but my wife and I both noticed that we each had 1 bonus point available to us the other night, how could that have happened? I know for sure that I allotted them after I dinged 50 a while back. Not that I'm complaining, but it would be nice to know how I got it so I could get more!!

You got 30 points to allow, you just forgot to add it. Check in the point allocation screen if it shows (30) 0/0 on main stat or if the points where the "30" is equals to 30 if you do the addition.