Issue in online games

In UT, if i was to go into squad battles, my game would run perfectly smooth, no delay, set pieces go normally. The second i go into an online match, I have massive delay on set pieces, the game runs smooth still, no delay during normal play, menus and cutscenes go by fine. But when its a set piece, suddenly, my shot is overcharged even tho i let my shoot button go, my camera keeps rotating after i release the stick, I make a pass after 3 seconds of waiting post pressing the button. I've tried changing a bunch of settings, tried even switching PC, but nothing works