- What have you selected in the Unit field for your single stats?
- If you are using a recent version of Grafana, you can use the query inspector to examine the raw data returned from PRTG. Does the raw data look correct? (Trying to figure out if this is a problem with the singlestat panel or with the PRTG data source).
You could also try creating an issue in the plugin’s GitHub repo: https://github.com/neuralfraud/grafana-prtg/issues