Try to open that .csv file with text-editor (notepad etc.). You should have lot of lines like in my last response.

Timestamp with millisecond resolution and two measured channels with ~7 digits each.

Did you have both sampling settings on the app at auto? I’m not sure if faster rates and lower sample sizes would affect your resolution while logging. Atleast it still shows 3 decimal places at DCV 8kHz/32smpl on the apps mainscreen and ~7 digits at graph view.

What programs have you tried for checking those logs? Excel? LibreOffice calc?

There might be some help also:
https://moosh.im/wiki/index.php/Processing_Mooshimeter_Logs