We are getting caught up on payments for January 9th and January 12th.
We had a 2 hour ($5) credit because you worked 5 hours for the last 2 projects at $5 per hour but we paid you for 6 hours for each of those projects. You indicated that you worked 5 hours on January 9th and 5 hours on January 12th.
Therefore, we owe you for 8 hours (-2 hours + 5 hours + 5 hours). Please bid $40 for this project for 8 hours * $5/hour. When we pay you for this project you will have been paid for all of the hours you've worked on our behalf through January 12th.