Reproducible on 5.2, 5.3.3, 5.4.0.

In editor serialized enums are showed in subcategories, but on WP 8.1 platform, they are showed as a one long list.

Repro steps:
1. Open project "Windows Build Problem.rar" (download link provided in the edit).
2. Build to WP 8.1 platform.
3. Build and run on Release configuration (Debug works the same, but takes more time to load).
4. When game loads click on "Pause" button on the top.
5. Click on button "Level List".
6. Here you can see that the lists are combined into one. Compare with editor, which shows sub-lists.