What method does this conversion system use?

[littleboy0k]

What method does this conversion system use? Will a single private key always return the same eos key?

[darccio]

It should be but I found that a private key can return an EOS key that doesn't match with the registered on genesis.

I asked in EOS StackExchange about that and I also got in contact with EOS to check what is wrong: https://eosio.stackexchange.com/questions/3626/fallback-eos-key-generation-yields-a-different-public-key-to-the-associated-on-g