Why is the sum function not working properly in HIVE?

Question

I have a table in HIVE that when I sum the columns for Value1, it gives me an incorrect value.

ID, VALUE1
1   10
1   -100
1   10
1   20
1   -60
1  110
1   10

When you sum all these values, you should get '0'. However, the query in HIVE when I use sum(value1) is giving me '-20', which is what you get if you were to add them all in order.

VALUE1 is INT.

Does anyone know how to fix this issue?