Hi Jean,
Here below are the steps I follow. Maybe you could reproduce it as well.
1) Open PD, verify if the option Mean Node is checked or not and, with it being unchecked I open a file from my database. I see one value of the Node.
2) Go to Options / Settings, check and then uncheck the Mean Node option and once again leave it unchecked, then close the file already opened
3) Open the same file from my database and now the Node has anothe value.
So which one is the mean and which one is the true value of the Node, keeping in mind that in both cases the Mean Node option is left unchecked?
PS: So far I knew my Node value, calculated as True is 23° 54' Aquarius and the Mean one is 25° 25'
Thank you