Its an option that the handovers may have been given to someone else at the end of shifts maybe so they could copy what was on there or something like that, officially and by the authorised person. Explaining why some were there and others not, and why some with the babies names in the charges but from different dates.
As a side note and this might eb a clue. The dates of incidents marked in her diaries, do they correlate with babies whose names were missing from the handovers or something along those lines?