Primavera Contractor

Using Contractor on a 9 hour calendar and the resource is on a 9 hour calendar, but when i view the resource usage profile the chart measures in 8 hours.

 

So basically its a chart with horizontal lines set at 8 hours but my bar chart is on 9 hours therefore when it shows one day my bar sits just above the 8 hour line.

 

Any ideas? (all possible options preferences etc are set to 9 hours (that i know of anyway)) Is Contractor based on 8 hours in its database and therefore this cannot be changed?

Thanks

Tony