Wow! That sounds about right to me, though I take middle lane while approaching because I am not sure which way to go. I choose the lane at the last minute. While inside the round about am almost always in the middle, it's easier to change it that way...
I know it is wrong but sometimes when you are in a hurry (which I am always ) you do tend to make mistakes.
Saying that I'll try to be in the lane next time round (will certainly take the right lane if you are driving pass by Claire or else I'll get a loud car horn! ...haha)