Prev and Next Buttons lose their button outline on my iPad Air iOS 7

1. Go to Curriki Geometry
2. Login as a teacher
3. Select Course
4. Select a Project
5. Select a page

Bug
Look at the Prev and Next icon.

It has lost its button outline. It looks like this < > instead of [< | > ]

Not a huge problem but makes for a very small target on the iPad.

I am NOT seeing this problem on my PC using FF or Chrome. Odd!!!

The bug happens in landscape and portrait.

A screenshot will be added soon.