OvuView detects the peak exactly as you have described (i.e. for the
last watery day). You can test it for example if you add 5 dry values
after the watery values, then the "5 days dry up" rule will detect the
ovulation day. The method needs to check the mucus values on following
5 days too as reappeared fertile mucus could mean still being fertile.
Symptothermal methods also use the last watery day as mucus peak, but
the peak must be also approved by increased temperature.
If you send us your data then we could explain you the exact reasons.
Regards,
Ian
Ian