Can't explain double lines in graph


My dashboard shows double lines which is not the intention. What is the reason that a 2nd line appears and how do I remove it?


The data comes via MQTT ...

and is linked to my node-RED dashboard.

These are the settings from my CO2 dashboard node ...

and the Temperature dashboard node.

Thank you,

A 2nd line only appears when you have a different topic. So either you find out, filter out different topics etc.

To check whether you have two different topics add a debug node, set to output Complete Message, showing what is going to the chart and check the topic values there.

or turn on show legend in the chart nodes and it should show the topics in the chart

I think it was a different topic. I disconnected a few other sensors from the flow and now see the correct lines.
Thanks everyone for the advice



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