zkSync made the update you can see in this link
on September 7th. While this update should not apply to old contracts, zkSync applied it to all contracts. With this new algorithm, staking rewards cannot be calculated. Please withdraw your deposited ERA tokens from the ERA staking contract.
You are seeing this message because you are a high stakeholder. After September 7th, this happened because the block amounts were 50 times higher than the usual block amounts, which resulted in unjust era staking gains. After September 7th, if there are no rewards you have withdrawn, we will send you all the pending staking. If there are rewards you earned after September 7, they will be deducted and sent. Please send an e-mail to firstname.lastname@example.org with your wallet.