Facing problem with UDFs

Hi,
I have made user defined function which takes two parameters; the first one is int and and second one is char(1). I am using this UDF three times with different parameters in my query. It works fine on my development machine but when i do the same query on live server it will overwrite last two calls with first call resultset. Below is the sample query for what i am trying to do:-
Select count(dbo.fn_GetContractCount(ContractID,'T'))[Total], count(dbo.fn_GetContractCount(ContractID,'N'))[New], count(dbo.fn_GetContractCount(ContractID,'U'))[USED] from tbl_Contract Where SaleDate between '01/01/2007' and '01/01/2008'
Results on my machine:
Total New Used
12 9 3
Results on live server:
Total New Used
12 12 12
Kindly reply ASAP. i will very thankful.

Check the data in production. Dev ENV may not be in sync with production env. It must run, also check the query u run both env
Madhu

What does the UDF actually do?

Have you tried writing this as a proper aggregate query, without UDFs?