Checked that as well...;) I'm guessing that we have not hit the last
"scan" of who is updated and who is not.... perhaps waiting a bit will
fix this. According to my rsync logs we finished getting the 5.4 tree
less than 24 hours ago...
If you have a local mirror, why not just configure you systems to sync from it instead of pulling the mirror list?
Also, you can check the timestamp file in the /centos/ directory to see how far behind your mirror is from the master pool.