When draggin some tasks a small amount, they jump later on the plan for no apparent reason.
Two tasks (A and B) of the same works orders have the same start time dependency.
I unlocked task A and dragged the task from 19th Feb to 20th Feb and it indeed jumped a further few days ahead. Clicking the undo button and then the task moved to the correct date of 20th Feb.
This issue does not occur if the DragTasksInsertSuccessors system parameter is enabled. Please complete the following steps:
Log into Orchestrate System Manager
Select File, system settings
Click on for 'Drag Tasks Insert Successors'
Click OK
Note: This setting is used to control what happens when dragging tasks to the right. On = successor tasks are inserted into the plan when dragging right. Off = successor tasks are pushed when dragging right