To reproduce:
- Set the values on config.inc.php file:
$config['calendar_default_alarm_type'] = 'DISPLAY'; $config['calendar_default_alarm_offset'] = '-15M';
- Create a event with no alarm value (None)
- Click to edit event
The value on alarm presented will be the value of calendar_default_alarm_offset config.
It should be selected the alarm event value.
The default should be used only for new events/tasks.