Flat leak line on S9

When downloading my numbers (for the last 7 days) there is nothing on the leak. Just blank.
I'm good, but not that good
Any Ideas?
What I've tried. Unplug, reinsert sd card, change mask. Hey maybe tonight I'll try nasal pillows they leak like crazy on my. That should tell me.

Put the mask on, breathe a minute or two, then manufacture a leak. Open your mouth, lift an edge of the mask, etc. and create a significant leak for 30 seconds or so. Then breathe a while, then simply take the mask off for a while.

Be aware that the leak is "averaged" over a time period, so it may not show up if you create a leak for too short a time period.

This is one of the reasons I don't like "unintentional leak" numbers. You can't tell the difference between the low end of the regular leak range and data failure. Also, if you set the mask type wrong, the data is simply wrong.