email campaign stats appear corrupted recently

We've been using Squarespace to handle email campaigns for a bit over 2 years now, and sent out 17 email campaigns in that time. The most recent that we sent out has very odd stats compared with the rest, and I'm wondering if there is any way to determine an explanation for this:

How could there possibly be more opened emails than there were delivered? This is exactly the opposite of the 16 prior campaigns we sent, where the progression went more as expected:

How can we verify that this last campaign was actually sent, and the stats are wrong? Do we need to resend the campaign? Should we switch to another email service instead?

3 hours ago, LukeCoop said:

How can we verify that this last campaign was actually sent, and the stats are wrong?

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