Today's monitors understand how to resize or use the various refresh rates. I wonder if this is a monitor from the bad old days? If so, you may have to dive in and create your very own MONITOR.INF file. Such is beyond the scope of what support I'll offer here but at least you and google can research how to create a monitor.inf for said monitor that could alleviate the issue.

You would also research the use of DXDIAG and the MORE tab, then the OVERRIDE button to lock in directx to that refresh rate.

Hope this helps,

Bob