I may be wrong here... but
I'm pretty sure ASP displays based on when the files were released, Aruba maintains multiple versions at once
i.e, they release new versions of (I believe) 6.5, 8.2,8.3,8.4 and 8.5 all at the same time, so it just happened that 8.4.0.3 was the most recent file added, not that it's more recommended over another version