Variable behaving very weird

I have connected to Influxdb3 oss to my grafana dashboard and build a dashboard however i used one variable and now wanted to apply in where clause in one the panel . see blelow. query is simple however it does not show the result . funny thing is that , when i change the dropdown form variable it shows the result for a fraction of sec and then result vanished from the panel. any leads to solve this will help. i am using grfana latest pulled in docker container.