We have OpManager 8721 and I like to know if it's normal that stats for new monitors (CPU, Memory, Disk, Network, ...) are unavailable for custum period?

For example, if I take an ESX device and I click in "Disk" tab and select report "Disk Write Latency", I have only stats for last 12 hours in the graph and if I click in the graph, I have last 24 hours. But if I try to click in "Edit Report", I have not options. It's blank. 

The same problem is in Performance Monitors on VM's for CPU and Memory. I have only last 7 and 30 days.

Thanks for your help.

HDS