Bar Necking (out of sequence)

Dear guys,

I am using P6 r8.2 and i am having some difficulties regarding the bar neck. In the working window, you can see the neck (out of sequence) but once i switch it to print preview, the neck was not there anymore, it is just simply a straight bar having blue & green color separated by the data date line. In experimenting, i tried to expand my working window around 2 inches of the normal size of the month column and by doing that, the neck bar appear on the print preview but it is not looking good. Please help if i am missing some configuration in my system.

regards,

Ritch.