Simplify the following text for a Grade 9 native English-speaking person.
Original: The bug is that this problem also occurs when the time zone function is disabled , therefore whenever the computerâ s time zone changes , all the events in iCal shift as well .
Simplified: The bug is that this function also occur when it is turned off , therefore when ever the computer 's time zone changes , all the events in iCal shift as well .