Your footprint posts are sorted by the date you select for each footprint. If your footprints do not show in correct order, this is due to a wrong date and time.
To fix the order of your footprints, edit the footprint that is not in order and choose the correct date.
Timezone issues: Please be aware, that 9am in one timezone can be after 10am in another timezone, even if it is the same day!
Feed issues: In your footprint feed, only your own footprints are sorted by the footprint date, footprint posts of other users will be sorted by the date created. This is, so you do not miss newly created footprints posts of others, that are in the past.