Module used as header...

I am using a Module as a header...pretty simple and straight forward to do. But I'm running into a limitation...I think...

1 - Added Blog Category to Main Menu
2 - Created header Module to display on Blog Category page
3 - Publish Module position top for Blog Category page

Works as expected except - that when I click on read more - I lose the Module header that was identified to display on the Blog Category page.

http://localhost/index.php?option=co...&id=20&Itemid=

I noticed that when I click on read more - that the Itemid number is not displayed - hence the Module header is not displayed.

http://localhost/index.php?option=co...d=20&Itemid=75

When the itemid number is included the module to correctly displayed - any PHP wizards out there that want to show me how to correct this defect so that I can have the itemid number passed on correctly when read more is selected?