I'm looking at the reporting for your email, and it's showing the full drilldown for both unique opens and total opens, which is much higher than 3. You may be too zoomed in on your screen, or something may be causing some kind of connectivity issue for the display on the site if it's like the list is just randomly cut off after 3 contacts.
If you're unable to resolve the display issue on your own, I'd advise calling general support so they can screenshare the Constant Contact tab with you, and troubleshoot further live.
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