What exact version and build number of MultiCharts are you running? (in MultiCharts go to Help tab-> About)
Is it a live or a demo Rithmic account?
Are you getting the same values in Rithmic Trader?
The issue has been replicated and forwarded to the development team.
The fix is targeted to the next version of MultiCharts 9.1 Release 5/ 10.0 Beta 2.
There is no ETA for these versions at the moment.