Grafana Table Transform 'Table' automatically switches back to 'Time series to rows' sometimes and behaves abnormally

I have a prometheus data source on Windows machine and a node_exporter on another linux machine which are integrated. Now, I need to create a table based on prometheus query results but table transform ‘Table’ behaves abnormally. I choose Table transform as ‘Table’ and try to create a table, when I save it, it switches back to ‘Time series to rows’?

And on the screenshot Transform is chosen Table. I want to create a column ‘Mounted on’ based on values mountpoint in the metrics, but after the save button nothing changes?

Am I doing something wrong?

thanks in advance

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