Fragmented sorting issue

Hi, I have a strange problem ocuring when I try to use OrderBy for any given propery: The ordering is fragmented.

What I mean by that is if I OrderBy on number I get something like: 1, 2, 5, 6, 3, 4, 7, 8, 0 and then 6, 5, 2, 1, 8, 7, 4, 3, 0 for descending. It seams like the result is getting orderd by something else before ordering on the number, but I have triple-checked the request and there is only one sort object in the sort array.

query.OrderBy(arg => arg.Code);

Gives: 

    [0]: "22565423125"
    [1]: "22565423216"
    [2]: "22565423236"
    [3]: "22565423294"
    [4]: "22565423130"
    [5]: "22565423140"
    [6]: "22565423291"
    [7]: "22565423297"
    [8]: "22565423614"
    [9]: "22565423622"
    [10]: "22565423627"
    [11]: "22565423647"
    [12]: "22565423231"
    [13]: "22565423285"
    [14]: "22565423637"
    [15]: "22565423642"
    [16]: "22565423120"
    [17]: "22565423221"
    [18]: "22565423226"
    [19]: "22565423288"
    [20]: "22565423300"
    [21]: "22565423135"
    [22]: "22565423211"
    [23]: "22565423652"

And 

query.OrderByDescending(arg => arg.Code);

Gives: 

    [0]: "22565423236"
    [1]: "22565423216"
    [2]: "22565423125"
    [3]: "22565423115"
    [4]: "22565423647"
    [5]: "22565423627"
    [6]: "22565423622"
    [7]: "22565423614"
    [8]: "22565423297"
    [9]: "22565423291"
    [10]: "22565423140"
    [11]: "22565423130"
    [12]: "22565423642"
    [13]: "22565423637"
    [14]: "22565423285"
    [15]: "22565423231"
    [16]: "22565423300"
    [17]: "22565423288"
    [18]: "22565423226"
    [19]: "22565423221"
    [20]: "22565423120"
    [21]: "22565423652"
    [22]: "22565423632"
    [23]: "22565423135"

I have tried switching indexes and still the issue remains.

I'm using Episerver.Find 13.0.1.