Photo Album Plugin Help

Hello. I need some help with the Photo Album plugin. RW 7.1 on macosSierra.

I would like the photos i add to be published in date order, with the newest ones at the top of the page. I thought it would be as easy as sorting the photos by date in the Edit section and then publishing. The problem i have is that the date sort does not appear to work correctly. It appears to sort the photos only by the day, rather than by year/month/day.

For example, all of the photos taken on the first of any month appear at the top, then photos taken on the second day of the month and so on. I have attached a snapshot of how the dates appear if i sort with latest date at top in Edit window.

I have 30+ kids in a special school desperate to be able to look through their latest photos. Can anyone help?