Thanks for your time.
OK I have looked at the Resource Usage page and see the issue. Task 1 has my resource spread out evenly over its duration, while task 2 has my resource working for only 2 days, as many hours as possible. Here is a screenshot of the Gantt chart reflecting this
http://imgur.com/T27K9TN How can I spread the resource evenly over task 2?
The tasks seem to be identical other than the name.
Also, sorry for the confusion, but the duration and resource time were actually 4 weeks and 12 hours respectively. That shouldn't change issue though.