Printing problem with front knee piece of cargo pants in pattern 6m to 4ys

Hi,all:

I just print out cargo pant in pattern of "6m to 4ys"( I did make one cargo pant in size 5 without problem), and all the pieces are printing fine except "front Knee" piece( number 6). It seems out of printing border, loosing 2 sides. just wonder if anybody has the same problem?