Why does the molar conductivity plot behave this way?

On the left image.. we see that specific conductivity is increasing at a decreasing rate, eventually plateauing as it reaches a maximum. I am unable to reconcile this with the molar conductivity graph to the right... shouldn't the decreasing molar conductivity be decreasing at an increasing rate... why does it plateau and such? Thanks for the help


[![enter image description here](https://i.stack.imgur.com/5Y6V9.png)](https://i.stack.imgur.com/5Y6V9.png)


