TV-Seasons shown mixed up

i have my TV-Seasons all stored in a Mainfolder (TV-Seasons) and every Season has it own Folder named by the Season.
The Problem is that (except of two Folders) all others are shown under the Mainfolder (TV-Seasons) mixed up.

The Problem is not new. The same was under iPad and iPhone!


I think this can be resolved by going to setting and changing to sort by file name rather than newest.
Hopefully that works.