When sections are put in a required order, once they finish the first, they will go to the second. 
However, if there is no order required, they will be taken to the first available section. This might not be the next section on the LP list though. Sections are numbered in the system as 1, 2, 3, 4, etc. If a user starts at section 3 and decides to continue to the next section, the system starts at 0 and looks for the next available section. Which in this case would be 1, not 4.