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It seems like clicks are not being counted properly per campaign. I had to resend a campaign to new users and duplicated it and sent to a new list (since adding and resending is not a feature (yet?), discussed here and here.) The link activity got populated immediately after sending with all links, except unique to the current campaign, reported as clicked at (about) the same time in the export.
An ‘click’ is only registered when the tracking link is being accessed. If you’re seeing large numbers of simultaneous clicks, the only probable reason is that the receiving ISP’s spam filter checks your email content as well as accessed the links to see if they are malicious before deciding to put it in the recipient’s spam folder or the inbox.
Thanks, that's probably it. These recipients complained that they did not receive the emails. Turns out that they were automatically unsubscribed by their server so I had to disable the one click unsubscription. Aggressive filter...