inconsistent sorting of track groups in web planner vs Android

As a "hack" to sorting track groups, I precede each name with a character "_" (newest), "a", "b", "c", "d"..."z" (oldest). With LM4 Android "z" and "Z" are at the bottom of the list. There is an inconsistency with the web planner - it puts "Z" at the top of the list, while "z" is at the bottom. I don't care which, but I suggest there should be consistency across platforms. I can guess the web planner has sorted strictly based on ASCII hex, whereas Android has possibly converted all characters to upper or lower case first?