Thats the Map with Flag F on the far left( attacker site) and like 2/3 players spawn there, some on the walls and like 50 outside on Point A. You are unable to get into the castle from outside once the gates are closed. I can post screens of the map and the issues later once i play in it again if needed.
thats wrong it only happend one time for me, the other 30 siege rounds were totally smooth
i only queue in europe, and my 2 friends i played with( live in the same city) had normal pings.