Archer [Improve Concentration] and [Arrow Shower] bug? RE

[reigneil]

what i've notice is our Improve Concentration has a larger AoE for detecting enemy its 7x7 and Arrow Shower AoE is 5x5 at 15 and 7x7 at 610.
what irowiki info's are different... which is true then?
http://irowiki.org/wiki/Improve_Concentration
This skill will also reveal any hidden enemies in a 3x3 area around the user.
http://irowiki.org/wiki/Arrow_Shower
Area of Effect: 3x3 ~ 5x5

[Playtester]

According to jRO wiki, AoE of Improve Concentration detect is 7x7.

AoE of Arrow Shower should be 3x3 on Level 15 and 5x5 on level 610.

Source: http://hunter.rowiki.jp/index.php?%E3%82%A2%E3%83%BC%E3%83%81%E3%83%A3%E3%83%BC%2F%E3%82%B9%E3%82%AD%E3%83%AB&usg=ALkJrhgj0Cw9d-TlFWgmZdroi7gPzlQ3pQ?%E3%82%A2%E3%83%BC%E3%83%81%E3%83%A3%E3%83%BC%2F%E3%82%B9%E3%82%AD%E3%83%AB

Update history reads:
When using Arrow Shower, modified so as to consume a single arrows
Change Arrow shower on the ground specified from enemy specified
Attack range of Arrow shower decrease (5x5 → 3x3)
Attack speed of Arrow shower became fixed ASPD150 from ASPD dependent
Attack power magnification rise of Arrow shower (R reduction, 2010/07/06)
Arrow shower Lv6 more attack range increase (3x3 → 5x5) (R reduction, 2010/07/06)

[reigneil]

about the Improved Concentration well maybe it is true that it is 7x7 and not 3x3 as Gravity sometimes do Ninja update. And for the Arrow Shower it is also mention in iROwiki kRO forum that this skill were nerf to be 3x3 ~ 5x5 changelog notice.

[Playtester]

Even more critical what I noticed when testing: Arrow Shower actually hits all targets twice on rAthena.

Edit: Unfortunately I can't figure out how to fix that one. I'll fix the rest, though.