Unequal distribution across OSDs

Ceph , on writing objects some of the disks are getting full very much ahead. looks like the crush map calculation is not correct

osdstat kbused kbavail kb hb in hb out
0 792044472 183702072 975746544 [1,3,4,5,6,7,8,9,10,11,15] []
1 790672896 185073648 975746544 [0,2,3,4,5,6,7,8,9,10,11] []
2 700233716 275512828 975746544 [1,3,4,5,6,7,8,9,10,11] []
3 927252696 48493848 975746544 [0,1,2,4,6,7,8,9,10,11] [] ><<<<<<<<< This is nearly full
4 654742612 321003932 975746544 [0,1,2,3,5,6,7,8,9,10,11] []
5 568450712 407295832 975746544 [0,1,2,4,6,7,8,9,10,11] []
6 793254988 182491556 975746544 [0,1,2,3,4,5,7,9,10,11] []
7 816994332 158752212 975746544 [0,1,2,3,4,5,6,8,9,10,11] []
8 724516484 251230060 975746544 [0,1,2,3,4,5,7,9,10,11] []
9 755386980 220359564 975746544 [0,1,2,3,4,5,6,7,8,10] []
10 758759272 216987272 975746544 [0,1,2,3,4,5,6,7,8,9,11] []
11 636963552 338782992 975746544 [0,1,2,3,4,5,6,7,8,10,12] []
12 1149376 387779584 388928960 [0,1,6,8,9,10,11,13,14,15] []
13 1243804 387685156 388928960 [4,5,6,7,8,9,10,12,14,15] []
14 1272632 387656328 388928960 [0,1,4,6,9,10,11,12,13,15] []
15 1358920 387570040 388928960 [0,4,5,6,7,8,11,12,13,14] []
 sum 8924297444 4340376924 13264674368

version: 14.04 Ubuntu Icehouse , Similar behaviour is seen in 12.04 also : build : 2:13