Hi @Eduff ,
I wanted to jump in on this ticket after doing some testing. With a test case I have set up to have lines scheduled in parallel I used the reschedule forwards button from the workorder schedule tab on both lines. Everything else in my test case was set the same as yours (parallel checkbox enabled with # of segments and then # of users on capacity calendar for scheduled dates).
When you say you batch rescheduled, can I confirm which button/feature you are using in Cetec? Is this the Batch Update Dates button on the Planning Gantt Chart?