CSV node - coloum header

Hello all,
I have created a flow with which I can read my modbus and write the data to a CSV file. However, I have problems with the heading of the columns in the CSV file.
Here is my flow

I have conifugated the CSV node as follows

The problem is that it gives me the column header for each new value

Can anyone help me to fix this problem? I don't know why there is always the heading in the coloum.

Thanks in advance.

Best regards,

There are 3 options as to whether to send headers at bottom of node configuration. You have it set to always send header column.