Some of the pre-existing servers haven't started updating since the change to f2p, so it's not just the new servers having problems with the leaderboards. From what I've seen from other threads the processing of that data was turned off during the site upgrade. It's not clear if it's back on yet but I have seen some sites update sporadically.
In the thread below re: my.lotro not updating, one of the Devs said this:
"With the launch of f2p and the new player portal, we turned the processes that collect the data off until things settled down. We've been in the process of ramping these processes back up; it will take awhile for them to catch up. Give them a few days. "