SQL access Group By and Sum - sql

Question

I'm having an issue with MS Access with my SQL statement.
I have companies and teams, and they each have a balance of money.
(Company1 can have team 1,2,3,4 and Company2 can have team 1,2,3,4,5. Though Comapny1 team1 is not the same as Company2 team1!)
But I have a ton of entries which each correspond to a seller.
I want to sum every balances for each company and each team, no matter which seller it is:
I actually have :
SELECT Company, Team, Sum(Balance) AS tot_balance
FROM Retro2014
GROUP BY Company, Team
But the amounts are 5 to 10 time bigger then they should be when i sum it manually. (But I have around 1200 seller, I can't do it all manually)
EDIT: What I want is something like this:
Company Team tot_balance
------- ---- -----------
Company1 Team1 1000
Company1 Team2 1530
Company1 Team3 120
Company1 Team4 500
Company2 Team1 800
Company2 Team2 750
Company2 Team3 420
Company2 Team4 820
Company2 Team5 120
... ... ...
EDIT2:
I have those values now :
Company Team tot_balance REAL_Balance
10 90 2 534.60 269.06
10 92 813.30 120.89
10 95 1 384.75 210.89
10 96 950.72 142.43
10 97 3 957.03 789.92
10 98 4 822.34 1128.71
EDIT3 : And the source values are those:
COMPANY TEAM SELLER BALANCE
10 50 123.65
10 90 L07630 245.06
10 90 L07630 4
10 90 L07630 8
10 90 L07630 4
10 90 L07630 8
10 92 L96420 32.93
10 92 L96420 87.96
10 95 35.74
10 95 16
10 95 4
10 95 12
10 95 12
10 95 131.15
10 96 L04771 65.5
10 96 L04771 12
10 96 L04771 8
10 96 L04771 8
10 96 L04771 48.93
10 97 L94605 61.93
10 97 L94605 4
10 97 L94605 8
10 97 L94605 233.76
10 97 L94605 344.97
10 97 L94605 90.33
10 97 L94605 38.93
10 97 L94605 4
10 97 L94605 4
10 98 L95652 42.51
10 98 L95652 34.75
10 98 L95652 549.26
10 98 L95652 320.36
10 98 L95652 20
10 98 L95652 112.58
10 98 L95652 41.25
10 98 L95652 8
Thanks,
Phil

Answer 1

As long as the table don't contain multiple entries on Company, Team, Balance
than you SQL should work just fine.
But given your explained issue, I pressume there are more values than what are shown and can therefore cause more rows with the same information shown more than once, which would result in an incorrect summerization. Here is what I would suggest:
Select Company, Team, Sum(Balance) as tot_balance from (
SELECT Company, Team, Balance
FROM Retro2014
GROUP BY Company, Team, Balance ) as b
GROUP by Company, Team