Sort Images

The way a column looks originally
The way it looks originally
When you hover over the heading

When you hover (physically or with Selenium) over the site.

manual hover
Manually hovering over the up arrow.  Notice the "Sort Ascending" tip.


Selenium hover

When Selenium hovers.  Notice, no tool tip about sorting.

The hover method is

public void hover( WebElement element ) {
    Actions action = new Actions(driver); // driver is already defined