'Problem Area' Not collapse fully when we expand the 'Coding Area'

[sdgun]

Description

'Problem Area' Not collapse fully when we expand the 'Coding Area'

Steps

Go to : http://arena.cloud.topcoder.com:3000
Login as lightspeed
Wait till the coding phase stats
Click Open
In the Code Editor Change the appropriate Language
Copy the solution

Then click on the 'Expand' button in 'Coding Area'

Expected Result

Must collapse fully

Actual Result

'Problem Area' Not collapse fully when we expand the 'Coding Area'

Environment

IE 9-11, Safari 5.1.7, Chrome 35.0.1916.153 m and FF 30 in Windows 7

Image