First mined bocks in DogeCoin

[seoincorporation]

The reward for each mined block in dogecoin is 10,000 Doge, but i was looking to the first blocks mined in the blockchain and the reward was different, how did that happen?

First block:
Generation 68,416.00DOGE
https://blockchair.com/dogecoin/block/1

Second block:
Generation 729,752.00DOGE
https://blockchair.com/dogecoin/block/2

third block:
Generation 11,183.00DOGE
https://blockchair.com/dogecoin/block/3

Fourth block:
Generation 324,378.00DOGE
https://blockchair.com/dogecoin/block/4

...

Generation 863,413.00DOGE
https://blockchair.com/dogecoin/block/6

So, the question is how did that happen if the block reward is a constant in the code, can someone explain it?