Sales Orders are disappearing during the "get EMV" process

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This is happening after our sales associates are done creating the sales order and have already clicked the EMV button, and swiped the card, then when the go back to click the "Get EMV Pmt" button, the sales order is gone.  The credit card processes fine, but the sales order disappears as if it never existed.  This has happened a handful of times and there is no rhyme or reason to it.  Can anyone offer any insight??