[help] someone can come help me please ~~~~

server can in le . All game setting is set already ,but when i in game and try to click monster and no delay but when i out a skill it delay about 2-5 seconds . i click npc no delay but hit moster delag about 5sec or more, i run to a place nid wait 5sec to stop and skill then no lag. i in game only 15ms (no lag) very smooth..
when i go any place .. that no problem .. only when i hit moster ... or click npc .. it need wait 5seconds ...the skill started ... but i run or clink the moster no lag .. only click the moster and skill it lag .. wat this problem ? (me english very poor so please dun blame me >.<).. all .. please help me :*::*::*: