walls in castle mode are useless. Sometimes anyone can glitch through
This should be posted in bugs, but yes, this happens a lot. If someone scrolls directly towards a wall fast enough to leave their minions behind, and their totem crosses the threshold of a wall before they slow down, the minions will teleport and catch up to the totem--and thereby skip the wall.
I have seen this happen very regularly over the past three days, so yet unresolved.
Customer support service by UserEcho