I have a <ul> with a number of <li> elements in it. A number of them are hidden and are added to the end of the list upon clicking with jQuery after().
However, for some reason, the elements added with after() are always a bit too close to the element they are added after.
I have made a jsbin to demonstrate here
Also, a screenshot to explain:

The reason for using after() instead of a simple addClass or show is because the list relies on applying styles with li:nth-child(even), so if the elements are there, but only hidden, it causes issues in the styling of the list.