Number showing on photos in iPad days view for photos

so after contacting apple, they said the number showing is the number of additional photos for that time period. However, in my case its not - the number of total photos do not match up when I count all photos for a selected time period. Additionally, I sync the same photos to each device - iPad and iPhone - yet my iPad is taking up twice the amount of space when compared to the same photos on my phone. Also, I continue to have some photos that don't sync when they are suppose to and duplicates of others. What a messed up ecosystem!