it has, since the beginning of time, failed to reset settings properly to the unmodified rates. Especially if a server crashes while modified. There are dozens of reports of it!
The MOTD never gets switched back but the Rates seem to. I just stepped outside base to confirm that I'm picking up the proper amount of Stone during the Week. ;P"WeekendRatesDisabledMessage":"Weekend Rates Disabled",
"WeekendMOTD":"x5 Weekend (Xp, Resources), x2 Taming",
"NormalMOTD":"x4 Weekday Rates",