Workcenter Calendar

For some reason I am unable to populate Fridays with ship dates
through MRP when trying to ship jobs. It makes my ship date the
following Monday, which throws off my capacity planning.

Has anyone ever experiencd this before?

Also, this is not as easy to fix as changing the workcenter calendar.
I've already tried changing this and I even had Epicor Tech Support
take a crack at fixing this problem.

Any help is greatly appreciated!