If you void a transactions, the record of it should remain and not affect your books. Are you pressing the Delete option from the register or are you voiding it from the actual check transaction by clicking the More menu and then tapping Void?
In the meantime of me getting your response, check out this guide to help you in the future about if you should void or delete transactions.
This will help us determine the next steps you need to take and what caused this. I'll be just around the corner when you're ready!
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