It seems there is a problem with the valves or the pressure transducers, either they don't respond to the settings or the settings are not done properly. So, I would suggest double-checking the instrument for any leak or damage and the software inputs.

From the second image you have shared, it is cleat that the P/P0 value was not varying much and is well below 0.1. It seems, the pressure range in the settings needed to be verified, also suggested by Ali Nematollahzadeh. I hope it will resolve most of your issues.

I do not see also the absorption curve, the pressure does not vary. There is some experimental problem

Thank you for all supports. I will check again as you mentioned