When setting the auto border zones to 3 x 3 there is an extra line in the middle of the "2" and the "B" on all sides. It's turned off when you toggle zone dividers off. The rest of the divider lines are appropriately positioned. I thought I saw a question with a picture referencing this problem but I couldn't find it again.
I'll post a picture when I can, but the description is pretty self explanatory.
Edit: It seems to happen with all odd zone numbers.