Solved Players keep xp & items upon death

I figured out the source of the problem now but im too afraid to edit much there.
The problem is in the main world folder, some settings there deny players from losing xp and items anywhere.
Here are the files: http://gyazo.com/83d9c6d5f1cdb178ffa2631c0a43dcb1

Any ideas how to fix it? Just generating new world would really suck since the current one has many building and so on..

Got the problem. Had to do some ingame gamemode commands etc.

EDIT by Moderator: merged posts, please use the edit button instead of double posting.