The above image means you've received interest recently on your liquid HBD balance, but not on your HBD savings balances. And that make sense, because you only have HBD in your liquid HBD balance, your savings HBD balances is empty.
There's nothing you really need to do in this case. But if you want to earn maximum interest on your HBD, you could transfer it from your liquid HBD balance to your savings HBD balance. But the amount of extra HBD you would get is very small, so I don't think you should worry about it.
Thank you for your very complete explanation and suggestion.
suggestion.
But in the future, I mean, if the interest changes after the hardfork, can I put hBD in savings?
Yes, you will be still be able to move funds back and forth between liquid HBD and savings HBD balances after the hardfork.