Just found this unwanted action. When a Marriage start date is processed with a date range such as "between 1850-04-01 and 1850-06-30", the application interpets this as a start and end date of the marriage and puts the dates into the start and end date field.
If this condition is found with DOB or DOD, it uses the first date and marks it as uncertain.
Please add to your BUG list.
