I understand the moon phase setting, have read much about it. Last month the moon phase reading on my Mudman was correct...new moon, full moon were in check with online moon phase data for Amsterdam (Home City is set to Paris).
I just checked moon phase on the Mudman and for today the reading is 10.8 days, for 08.31 it's 13.8 days, and for 09.01 it's 14.8 days...with the indicator showing a full moon (indicator is completely white/clear).
However...when I check online moon phase data for Amsterdam, then the next full moon apparently is on 08.31 (15:59)...and not 09.01.
Moonrise, Moonset and Moonphase for Netherlands – Amsterdam – coming days