This is the primary cause of problems. Simply switch the Display In dropdown box to the correct mode for this project. See screenshot below.
What are weekly and daily mode?
Resources can be scheduled by the day or by the week. In fact, you have cell-by-cell control over this. So Jimmy can be scheduled by the day for February and then by the week thereafter, or any combination thereof. You can switch between the two modes via the Display In dropdown box. If you choose Hybrid, you can do both at once.
If resources are in the wrong scheduling mode, simply right click their role and choose Change Scheduling Mode.
If you want to change only some cells between daily/weekly mode, highlight those cells and right click. Choose Change Scheduling Mode.
If all your new roles are defaulting to the wrong mode, go to the Project Info Tab and change the default.
If all your new projects are defaulting to the wrong mode, go to the Engagement Type - General Tab and change the default.