Question about bnb vault, staking and cumulative interest

I have locked staken my bnb and they get return to the vault afterwards.

However, the locked bnb gets counted under the cumulative interest.

Is it because the bnb saving and staking are counted as one? Or what is the explanation here.

I know it's probably just an UI error, but I would be very sad if these tokens gets calculated double, which will hurt a lot when selling one day.