It might be something to do with temperature change, even in a cellar the temperature can change by about 5-10° throughout the day if its not set up correctly which can half or even quarter the shelf life of your food without you knowing it/noticing because it'll go back down by the time you next check.
Idk I make sure I don't leave anything unattended for too long, especially things like eggs which seem to like spontaneously spoiling for me despite them being in a cellar with 40+ days to spoil on them.