*D3* Characters wont follow

Hey, so i am playing d3 with an extra account, and for every big chunk of monsters, my characters goes out of sync so to speak. Is there any configuration about this? Since its happening quite alot

[lax]

This question has been asked and answered a few thousand times

Did you take a look at the Diablo 3 Quick Start Guide? D3 Quick Start Guide, Part 4: Gameplay as a multiboxer
It even includes a video demonstrating simple tricks to help you out.