How can I delete old info in Sleepyhead?

I am currently on month #2 of CPAP treatment, and am now able to use an SD card in my REMSTAR Pro C-Flex machine (it had a cell device installed in the slot for the first month). I have downloaded and installed SleepyHead v0.9.3-0 (beta), and imported data from the SD card. I'm not certain why, but there are about two weeks of "data" from a period prior to my obtaining the machine - very STRANGE data! It shows AHI in the range of 7,000 to 22,000. I suspect this is from a testing period.

I was able (after a couple of crashes) about to delete some of the data in SleepyHead. When I go to the Daily view and choose the dates in question, it shows "No Data." However, the info still shows up on the graphs and in averages, which skews things rather badly. I tried creating a new profile and importing only the data from the date when I started using the machine, but the erroneous info still shows up in the graphs. I even tried uninstalling and reinstalling SleepyHead - no change.

Any suggestions?

I am not sure I understand what is going on in regards to some of the old unwanted data being present on one graph and not another....or how to fix it.

What I would do if it were me would be totally remove that old weird data from the machine first (reset the machine to zero) so that the weird data no longer gets put on the SD card and thus into the software.

You should be able to manually remove the weird data files from the P0 folder too.
Then create a new user profile and import into SleepyHead and see if the unwanted data is still present.
Trying to remove it after it has been imported and calculated is a bit iffy....I would try to remove it from the SD card so it never gets imported if it were me.

Is it possible that the machine has been used for rental and was connected to a wireless device to communicate with a lab?