Prometheus label_values() return incorrect vals if hyphenated

Hi, i’m using grafana 6.7.3 and building kafka dashboard. When using label_values (topic) for data source prometheus and regex /^[a-zA-Z].*/ i end up getting values in a form of a-b-c and a-b-c-d whereas prometheus contain only topic=“a-b-c-d”. Any suggestions how to debug this? Seems that this is the only topic that gets partially mangled and rest are fine.

fixed by calling label_values(metric, label)