I see this issue frequently, and have always put it down to lag as well.
Also if I'm remoting into the bot box it will most likely start doing this straight away, maybe due to me choking up the upstream bandwidth.
May bandwidth varies from 200 - 700 most of the time.
"It's your end, fuck off" is not really the response we want, and a player can hand a quest in by waiting for the ui to respond on each click with latency up over 2000ms. Why can't a bot wait for latency at each "click" like we do?