Why are transactions missing in QuickBooks?

https://quickbookhelpdesk.com/blog/missing-transactions-in-quickbooks/

QuickBooks makes it easy to keep track of your business finances by recording income, expenses, invoices, payments, and bank transactions in one place. When everything is working properly, your financial records remain organized and up to date. However, it can be concerning when you discover that certain transactions are missing from your company file. Missing transactions can affect account balances, financial reports, bank reconciliations, and day-to-day bookkeeping. Fortunately, this issue does not always mean that the transactions have been permanently lost. In many cases, they are simply hidden because of filters, incorrect dates, syncing delays, user permissions, or other settings that can be corrected with careful troubleshooting.