[Solved] Bitcoin Core - Creating invalid addresses

[Propogue]

When I try to create an address to recieve BTC, the Bitcoin core client seems to work fine but creates addresses that are invalid.  For example: 2NGMDeJdpn1TStxeA5EcdfHy4t2jDqrv3Pa and 2NA1gSNsMBmtSRLJTU8dB9AMrgF2vMmsVMd

Also, it has lost some addresses that I created yesterday.

Can anyone help?

[TryNinja]

Are you running your Core wallet in testnet mode?

According to List of address prefixes, addresses starting with a 2 are Testnet script hash addresses.

edit: I just sent 0.998BTC (testnet) to your first address (2NGMDeJdpn1TStxeA5EcdfHy4t2jDqrv3Pa). Here is the transaction.

[BitMaxz]

It looks like a testnet script hash this is use only for testing purposes.
Take a look at this wiki https://en.bitcoin.it/wiki/List_of_address_prefixes
I think you can try to disable it by typing this command.

Code:

-testnet

Or edit and add testnet=0 in your .conf file.

[Propogue]

BitMaxz and TryNinja - I have no idea how come Windows 10 offered me testnet instead of the live client on start menu but you are both correct and I'm very grateful.  All working again - thanks.