Please install the latest version 7.17c. In addition, it may help to make sure that "Start profiles in parallel" is chosen on the Scheduler tab sheet (via Tools and Settings button).
If you are using real-time jobs, it may help to use the real-time mode "Process Complete Folders".
Finally, to make sure that the scheduler runs even when you are not logged in to Windows, you may want to install it as a service:
https://www.syncovery.com/documentation/faq/service/