Logs is flat on the overall scren but works on individual screen


I have the Open-UV sensor activated and I am logging it for fun. It works fine, but this morning it showed constant values in the overall view:

But when I to see the curve from this sensor only, it works:

(The Raspberry was offline during the night, therefore the slight increas of UV during the night. Just an interpollation prbolem)

Any idea whether I do something wrong or it is a bug?
Do you need information about this?

It could just be that the WebSocket disconnected in your browser at some point. If you reload the page, does the overall view look right?

No, that didn’t help:

Also restarting the webthings server again did not help