I don't think this has been reported already because I didn't see a similar post for this.

Go to 'My detailed stats', click on 'Link to users host stats'. Once there, pick a host and click on graph symbol. Compare a quantity for a date on the 'Best five days' summary to the corresponding day in the 'Last 30 days' summary at the bottom. The quantities do not match because the date shown in 'Best five days' is one day after the date shown in the 'Last 30 days' summary for the quantity shown.

http://www.boincstats.com/stats/boinc_host_graph.php?pr=bo&id=1825164

Fixed this.