Dashboard Last N Hours Widget - 1 hour period doesn't show the correct time frame

I'm evaluating OpManager for a potential purchase and have found some issues. I'm running OpManager v12.2 on Ubuntu Server 16.0.4 LTS. In this issue, there is a problem with the dashboard widget "Last N Hours" where the time frame produced on the plot doesn't match the period selected.

When selecting "Last 1 Hour" period, the plot shows instead the prior hour (ending at the top of the hour) rather than the last 1 hour (ending at the current time).

When selecting "Last 2 Hours" period, the plot shows the last 2 hours (ending at the current time) as would be expected.

I've attached diagrams outlining the issue.