Are these Statistics numbers wrong?

There is some discrepancy or wrong statistics numbers in my report. The sum of Trackable opens (29) + Untrackable contacts (19) is (48) greater than number of emails delivered (43) - see the image. Are these numbers wrong or am I misunderstanding something?

Thanks for spotting this! maybe @Olivier_Beorchia you know?

@Olivier_Beorchia seems to be very busy…
Anyone else that could clarify this?