OPC Calendar Import issue with 1 of my GCs P6 schedule

Hello,

This is a new one for me. When I import GCs P6 schedules into OPC I have not had any issues importing their Project calendars.

However, when I import a GC P6 schedule on my new project as a "New" schedule, OPC defaults to Workspace calendar. In the calendar column the default filter is workspace instead of project. Just to verify my import setting, I imported another GC P6 schedule with no issues into the same Workspace and have no issues seeing their Project calendars.

What might be causing this issue? Is this a possible GC export issue?