I found out that when its laggy this message shows up "Boss we are nervous lets add some helpers"
Thats because its adding troops that dont realy excist...
so if u have lets say 100 units and u come to castle it oftens add up 3-4-5-6 extra units....by lag!!!
just add the 100 units that were in castle from beginning
if it still dont work add 90/100 and im sure it will work