Thousands of Santa Clauses (Chinese-English bilingual version)

On Christmas Eve, Santa Claus would personally deliver gifts to every child.
But as days went by, the number of children grew,
and Santa Claus couldn't manage all by himself.
So, he prayed to God: "God, please turn me into two Santas!"
God granted his wish.

After some time, the number of children continued to increase.
So, the two Santas prayed to God: "God, please turn us into four Santas!"
God also granted their wish.

However, the four Santas were still overwhelmed.
So, they prayed to God: "God, please turn us into—one million Santas!"
God still generously granted their wish.
Unexpectedly, a major unforeseen problem arose at this point...!
Can you guess what it was?