Next block is
https://blockchain.info/de/block/00000000839a8e6886ab5951d76f411475428afc90947ee320161bbf18eb6048

wallet is
https://blockchain.info/de/address/12c6DSiU4Rq3P4ZxziKxzrL5LmMBrzjrJX

And there the balance seems to be correct:
http://explorer.b2x-segwit.io/b2x-insight-api/addr/12c6DSiU4Rq3P4ZxziKxzrL5LmMBrzjrJX/balance
5005988948

Thanks, this must be it!