Missing transactions are possibly edited, deleted, or not entered at all, ecplumbing911.
We can review the Audit Log to verify the exact reason. Here's how to do it:
If the transaction was edited or deleted, you can use the details in the Audit Log to recreate it. If you can't find the transaction in the Audit Log, I'd recommend creating it.
I'd also appreciate if you can provide more description about these missing transactions. Thanks in advance!