Karma vs Leblanc Tether range
I spectated a game with a Karma vs Leblanc mid lane. You can probably guess that there were several trades where both parties just went ahead and tethered each other with their snares. However, what should be noted is that the wiki states that both Leblanc and Karma's tether ranges are 1000 range. As they did their little dances around each other, Karma's tether broke while Leblanc's remained active.
Clearly, Leblanc's tether range is longer than Karma's. The wiki is either wrong in how they gathered information, or this is an unintended difference in tether ranges.