I saw a post from a couple years ago with the same issue that didn't have any resolution so I thought I'd revisit this. I have a machine group that has a couple OU's in it and some single machines that are apart of those OU's, but I have them set to exclude when scanning. All of my results when scanning this machine group show that it's still trying to scan these machines though.
Here you can see where I have them listed to be excluded from the scans.
Here are the results of a scan from that machine group that shows the machines as trying to be scanned.
