I still can't see the y axis scale on the chart.
What is drawing the green line, I only see one input to the chart?
Can you show some debug from when the chart is working correctly please.
I notice you are using an old version of node-red, is there a reason for that? Though I would have thought it unlikely that this is caused by that. You also are not using the latest dashboard so it might be worth upgrading that.
Edit, also when you say the time is correct at the end of the chart are you sure it is not the others that are right and the one at the end is wrong? Since you are using UTC mode the times should be UTC not local time. I am seeing that so I think there is a bug there.
Further edit, I have submitted a bug for the timestamp problem
