AoF and AS effect (in General)

I found out that AoF give a huge AS affect boost if it is equipped on my W.

My character is: EMW. E is casting AS.

Scenario 1: W wears AoF. AS effect is 238612 HP to each minion.
Scenario 2: E or M wear AoF. AS effect is 197202 HP to each minion.

I test the scenario with the same opponent that do not have dispell.

Can anyone explain why?

Perhaps the use of a Cornuthaum also?

or it simply displays the effect differently since your wall is the last minion? (this has been reported before)

No cornuthuam either.

Shade may be right. It could be that my Wall is last and AS report the effect on the last minion. That explains it a lot.

Wasn't there actually a post about how the AoF causes a display change based on what minion you put it on? Even Jon commented on it, so it's official!(tm)

We were chatting about this not too long ago and I ran the
numbers on my character. My big AoF is on my AS enchanter and
the effect is listed as the big total, AS + AoF boost.
In reality though, my tank has the actual AS bonus to HP,
the enchanter with +7 AoF gets 21% more HP and the enchanter
with the +10 gets +30% more HP which is the displayed effect.