This is due to some servers not updated yet, its a complicated process to update it, especially since they have so many different server hosts in so many regions.

Basically, the server is not up-to-date. try finding another server.

Confirming this on other castles aswell.

@Fastburn, that's actually another bug entirely :P That one is when you re-log, you can occasionally be put back onto the ground rather than on the platform you were on, so therefore can be trapped WITHIN walls etc. seen it happen a couple of times too.