Work load by shift issue

I cannot get P6 to show work across both shifts in my resource profile despite the schedule shoing correctly as a 24h operation.I thought it must be a settings issue so compared all settings against my colleagues and they all match with his working fine.  We are working from the same project, using the same resources and filters so cannot understand why his shows over the 24hour operation and mine will only show over one shift.  This is causing a huge issue when reporting as the reports used for the s-curve are only picking up one shift of work rather than both causing a huge under-report.