Recommendations with a due date show up first. The sooner the due date, the higher the recommendation will be on the list.
Recommendations with no deadline show up next. If the learner has multiple recommendations with no deadline, then the ones assigned first will appear first.
If you recommend multiple skills simultaneously, they should show up in the order in which they are recommended. In other words, the order you see in "Selected tasks" is the order in which the recommendations will show up on the dashboard.
For more information, check out this how-to guide on recommendations!