Why is the claimable amount different from the amount I unstaked from the pool?

When you request to unstake some or all of your ETH, you will not receive it instantly. Instead, there is a short delay, due to the way the Ethereum protocol works.

Until your ETH is available to claim, you will continue to earn rewards. These rewards will be included in the amount you are able to claim once the unstaking process is complete.

For more details on how unstaking works, see here.