Anon, mask up and turn the system on, then feel and listen for leaks at the machine in the humidifier area, at the hose connection, along the hose and near the mask connection. Also check that the nasal cushions are fitted over the frame ring and the fine diffuser holes are not damaged. It looks like leaks might be high from the data, but inspecting the machine, hose and mask is the best bet.
Thanks for the reply sleeprider, I don't use a humidifier also I've checked everything every night before i sleep to ensure that there's no leak. But every morning when i wake up from my sleep and check the mask fit status, it's always showing a red face.
My sleeping partner told me, at times she can hear some air leaking from the mask but no matter how tight i strap the mask, it still shows that the mask isn't fitting well. So i wish to find out if it is due to the mask or is it because the air is leaking out from my mouth.