Hi there Moezzz,
It's vital all your transactions be correctly entered so that your books can be well balanced. QuickBooks Online is a great tool able to help you keep track of sales and expenses so you can see the profit of your company. I can point you in the right direction for assistance with missing transactions.
One cause for transactions not appearing would be browsing data. These temporary files can accumulate in your system and can affect navigation in any cloud-based software like QuickBooks Online. Here are some steps to resolve issues caused by browsing data:
If the error persists after trying these steps, I recommend reaching out to the QuickBooks Online support team outside of the Community. They'll be able to view your screen with you in a secure setting in order to troubleshoot the error further with you, as well as collect the necessary information to notify the engineers. You can reach them using these options:
Schedule a Callback or start a Chat: click (?)Help in the upper right > type and enter "Contact support" into the QB Assistant > click Contact Us > explain your situation > click Let's Talk > choose Get a callback or Start a Chat.
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If you have any other questions, feel free to reach out here.