If you changed the archive setup , you should at least delete the actual .rrd file in order to restart the persistence.
If that does not help you migth (also) suffer from a ( to me unexplained) problem. Please state your kind of setup (openHAB version, Java version and OS).
If you are using an openhabian setup, installing the option “InfluxDB+grafana” did overcome the issue.
Look here
BTW I’m back home as well.