Appending sections in jQuery is adding too many html blocks

I am attempting to have clickable "Add Section" buttons that when clicked will generate and HTML code block. There is a main block and a sub-block. I have it mostly working but the issue comes when I have several main blocks on the screen and I start adding the sub-blocks. I want to only add one block at a time but every time I add a new main block and then a sub block to the previous main block, a sub block for every new main block is added. How can I add just one each time? Follow my JSFiddle link for clarification.

- "main block" is triggered when "Add Question Block" is clicked
- "sub block" is triggered when "Add answer" is clicked

Thanks!