My Beginning balance and the Balance sheet running balance does not match.

Let me provide some information about the beginning balance and balance sheet in QuickBooks Online, @userishan.

The opening balance is the total amount your bank has recorded in your account at the beginning of the statement period.

When your QuickBooks Online beginning balance doesn't match the bank statements, it's called a beginning balance discrepancy. Here are the most common causes of a beginning balance discrepancy. 

• The amount or account of a previously-reconciled transaction was changed.
• A previously-reconciled transaction was deleted.
• The amount or account of a transaction that was connected to a previously-reconciled transaction was deleted or changed. 
• A transaction's reconciliation status was changed in the register.
• The account's opening balance is incorrect.

Please check this article to find out the recommended fix for the mentioned reasons: How to Fix Differences Between QuickBooks Balance and Bank Balance.

Keep me posted if you have other queries. I'll be glad to help you. Have a nice day.