Krugs spawn bug GAMEPLAY

I don't know if it has been mentioned before or if it is even a bug. It's only happened to me once and I haven't gone to test it again. I was kiting the Krugs getting closest to the wall closest to top lane and I don't remember if it was the largest Krug or not, but when I killed it the next one spawned behind that wall into top lane. So yeah if that's not supposed to happen, then I'd recommend you try and look into it. :}