Why do proxy opens vary so much between two similar emails?

My question is with same contacts on a mailing list for an email that was sent two weeks apart: So why such a difference in Proxy Opens in two weeks?

1) Why is my most recent email so low with the “Confirmed Opens” versus email on same topic sent 2 weeks ago?

2) Why is Proxy opens so much higher now than two weeks ago email?

3) When I look at All Opens by contact, it doesn’t show they opened email. Only contacts with Confirmed Opens show Engagement.

*Email Sent THREE DAYS AGO:

ALL OPENS: 1,039 (53%)

CONFIRMED OPENS: 288 (14.9%)

PROXY OPENS: 751

*Email Sent TWO WEEKS AGO:

ALL OPENS: 1,121 (58.2%)

CONFIRMED OPENS: 1,094 (56.8%)

PROXY OPENS: 27

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