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So what happens is the Steemit community has operated a Hard Fork for the network. Copied all accounts and balances to Hive platform, as 1 Steem = 1 Hive
Currently, you can use both platforms with the same login username and password.
Why they do that, It's a long story, I suggest you read these articles:

https://decrypt.co/29416/steem-network-to-seize-5-million-from-its-own-users

https://steemd.com/steem-hf23-suit.pdf

https://peakd.com/steem/@holger80/calculate-the-amount-of-seized-assets-in-steem-hf-23

Regards

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