Possible bug with Reporting graphs

[opnfwb]

Greetings, I have a strange issue with 17.7.5 AMD64 and the Reporting graphs. I have performed a fresh install of 17.7 and have not restored any configs or previous RRD graphs.

What I am noticing is that the long term graphing resolution does not appear to be working correctly. For instance, if I select the last 6 days of usage data, I can only see 1 hour granular details in both of the Low and Medium options. If I select the "high" option, no detailed data is displayed and the graph appears to revert to a very low resolution.

I've included screenshots to show examples of what I am seeing. Is anyone else able to duplicate this? I have tried using the option to reset "Reset RRD Data" in the Reporting Settings and I waited a few days for graph data to rebuild. Unfortunately this didn't resolve the issue.