ADDM is waiting for the timed exclude to finish so that it can process IPs you have requested in your scan. It is doing exactly what you told it to do.
If you do not want this then you need to set up your scans differently. Have the scheduled exclude range cover all the time defined by the scheduled scan and it will not block because ADDM will see there is no possible time that it can wait for the IP being available to scan.
You would need to set up two scheduled scans, one for the week days, one for the weekend and the exclude would need to cover the IPs during the week.