Hello @roberts7321 ,
I took a look at the last email you sent, and it says 21 for the DNO report in the email's overall reporting page, and on the DNO report drilldown. It's possible that there was a slight delay between the overall reporting page's display when you looked, and when one of the DNOs did end up actually opening the email. If you're still seeing 22 displayed despite 21 being the true number, I'd suggest clearing your browser cache.
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