Perhaps you need to re-schedule the start date or move the end date of your project.

Moving the start date

Moving this will also move the project's end date just as many business days.

Let's say your project is set to start on a Friday, and you move it to Tuesday the next week. Upsales will then look at the length of the project based on what due dates you've set for your to-do's and move the project end date just as many business days as you move the start date. 

Moving the end date

Works the same way as the start date.