Have you experienced guest purchasing tickets for off-sale performances?

Hi

recently we noticed that some guests purchased our performance which are on off sale. We are closed on Monday - through Wednesday and guest brought tickets for these days. Those performances are marked as off sale in Tessitura, those days are greyed out in plan your day( website) and TNEW.we tested ourselves to buy tickets for these days and we can’t. I Checked the status for these performance in database and these days have off sale status. 
did anyone else had similar experience?
please advise. 

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