OOOPPPPS. Please explain the Razz Rankings

[Chicos75]

New to hoRse. Please help a newbie

I thought an Ace was a low card. Why did I not win.

PokerStars Game #6956603335: Tournament #35502768, $5.00+$0.50 HORSE (Razz Limit) - Level VIII (200/400) - 2006/11/09 - 16:29:42 (ET)
Table '35502768 1' 8-max
Seat 1: BusterPapa (3863 in chips)
Seat 2: Chicos75 (4504 in chips)
Seat 7: Sexynrc (3633 in chips)
Sexynrc: posts the ante 40
BusterPapa: posts the ante 40
Chicos75: posts the ante 40
*** 3rd STREET ***
Dealt to BusterPapa [7c]
Dealt to Chicos75 [5d 3h 2c]
Dealt to Sexynrc [Th]
Sexynrc: brings-in low 60
BusterPapa: raises 140 to 200
Chicos75: raises 200 to 400
Sexynrc: folds
BusterPapa: raises 200 to 600
Chicos75: calls 200
*** 4th STREET ***
Dealt to BusterPapa [7c] [5h]
Dealt to Chicos75 [5d 3h 2c] [Js]
BusterPapa: bets 200
Chicos75: calls 200
*** 5th STREET ***
Dealt to BusterPapa [7c 5h] [6d]
Dealt to Chicos75 [5d 3h 2c Js] [Ad]
BusterPapa: bets 400
Chicos75: calls 400
*** 6th STREET ***
Dealt to BusterPapa [7c 5h 6d] [2s]
Dealt to Chicos75 [5d 3h 2c Js Ad] [8d]
BusterPapa: bets 400
Chicos75: calls 400
*** RIVER ***
Dealt to Chicos75 [5d 3h 2c Js Ad 8d] [Kh]
BusterPapa: bets 400
Chicos75: calls 400
*** SHOW DOWN ***
BusterPapa: shows [4c 3s 7c 5h 6d 2s Ks] (Lo: 6,5,4,3,2)
Chicos75: mucks hand
BusterPapa collected 4180 from pot
*** SUMMARY ***
Total pot 4180 | Rake 0
Seat 1: BusterPapa showed [4c 3s 7c 5h 6d 2s Ks] and won (4180) with Lo: 6,5,4,3,2
Seat 2: Chicos75 mucked [5d 3h 2c Js Ad 8d Kh]
Seat 7: Sexynrc folded on the 3rd Street