everyone i just get

Hello everyone

i just get a bit of issue in course description section .

i write the description into the box , then i click on Show the Course Overview structure and Preview Options. there are about 52 units.

the issue is , the course overview is before the description on my site , how to let the description first ?

here a link to where the issue displed

http://www.lidiaacadmey.com/courses/english-course/

thank you