In Indonsian they have different time zones and their moon times
are different at different times too.
Over there there are lots of "soothsayers" to whom the people there
llke to believe in them. They like to consult them for their "best
hours" of celebration, or the "best hours" on where their God will
"arrive on time" to "bless" them.
Every soothsayer has their popular clients who have their own
beliefs and so on. Thus over time they have different views of
days for their Ramadan celebration.
The result of who was more correct is dependent on who was more
popular and convincing with believers whom had believed they have
had received more blessings in the past on dates and days
of Ramadan from such and such soothsayer's predictions.
In short, because of such a large variety of soothsayers and
forecasters in indonesia, their celebration day of Ramadan has
become a dynamic day and time depending on everyone in the
different parts of the vast country.