Great - glad you found the source of the problem and you're welcome for the assistance.
When working in the task form, you need to be very deliberate. Enter the task an duration. In the task form, select Fixed Duration and click OK. Then select the resources and enter the work.
If the majority of your tasks will be fixed duration - you can either change the default task type in File > Options, Schedule. You may change the task type to fixed duration on all already created tasks.
- Select all tasks (click the Task Name column header).
- Click the Task Ribbon and select Information.
- Click the Advanced tab and select Fixed Duration
- Click OK.
I hope this helps.