No Click-Through Distribution on Resend

Looking at a recent send, I see that I had 111 clicks on the resend, but when I check the Click-Through Distribution on the resend, I have no data. The data for the initial send is all there and fairly consistent with expected results but nothing for the resend to non-openers. It has been 11 days from the initial send and 5 from the resend, so I expect data. I have never encountered this before and certainly be asked about it by my higher ups so is there a reason for this or just "it happens"?