Steps:
- Take a unit, for instance a Scout.
- Move the unit in opponent’s Town Center range until it starts firing.
- Move the unit out of Town Center’s range.
- Notice the Town Center starts shooting 1-2 additional arrows even after having moved out of its range.
This has gotten worse since last semi-patch. It might have something to do with the change they made where all buildings now show their range when being constructed. That change might have messed up the Town Center’s range depiction.