When I make a new level, it doesn’t reorder. Some levels reorder but some don’t. For example level the list shows level 5 , 6, then 10. Why is this? I am I doing something wrong?
I’ve had this problem once before. And still do.
I think the issue is that the editor doesn’t realize that a “10” comes after a “9”. The second digit deems…how do you say, inaccurate? to the editor. I’m not sure how to give an exact specification of this problem.
So, if you want to fix this temporarily, reorder your levels in this order:
1 (your first level obviously, which is probably the main menu?)
10 (you are correct, this is your second level)
11 (indeed, this is the third level)
12 (fourth level)
13 (…you get the point…)
14
15
16
17
18
19
2 (when re-ording this to your 12th level/s, do not put the “0”. Well you could, but just to prevent confusion, leave it out for now)
20
21
23
24
and so on and so forth. This is how I fixed it for me 
I hope I was able to be of assistance
thanks this really helped.