password for wallet.dat is not compatible in core

[Lancaster255]

I have a wallet.dat with a password. The password for some reason does not compatible in bitcoin core When checking the hash with hashcat, my password is suitable. 
Why wallet.dat password is not compatible in bitcoin core?

[culdesac]

You probably have a hacked/modified wallet. Is it yours?

[Mem5]

Have you tries to import .wallet file in bitcoin core first?