Hi Natasha,
Where are viewing the results from? If this is concerning a date field, the issue may be that the date has been stored as local midnight in the time zone of collection (UTC+3) occurs on the previous day in the timezone you are viewing (for example, EDT is UTC-05, so 'today' in Greece appears as 22:00 the previous day).
We are changing Survey123 to record local noon in the future, which should help reduce these types of errors.