Electric Stove Coil Heating Unevenly
It's very common for coil type electric elements to heat a little bit unevenly, even when they are brand new. If it's really uneven it's usually due to:


The element wearing out, leading to some parts being hotter than others
The element warping, leading to a loss of contact with some parts of the pots and pans you use


From the picture you've sent it could be a mix of both of these issues. 

A pan with an uneven bottom can lead to this as well, if your pan rocks back and forth on a flat surface it's a sign maybe the pan is part of the problem.

You can't fix these elements, when they're shot they're shot, so if it's due to worn elements replacement is the best bet (if you live in a rental ask your landlord, you shouldn't have to pay for it). They don't cost much, you could probably do all 4 for less than $50 USD. Some brands have upgrades where you can install ceramic or maybe halogen ones instead, if I owned it that's the way I'd go, but they are more expensive.