Blockbox exporter nodes showing down

We did some configuration with blockbox_exporter, It is showing normal in Prometheus , But in grafana dashboard some nodes showing Down,
Any one can see this issue
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  • What Grafana version and what operating system are you using?

  • What are you trying to achieve?

  • How are you trying to achieve it?

  • What happened?

  • What did you expect to happen?

  • Can you copy/paste the configuration(s) that you are having problems with?

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Any help will appreciate