Power Bi Filter data automatically

Hi,

Im  trying do report where i need to compare some data from different months. But my powre bi is filtering duplicates rows where i have the same id.

Sample data:

IDClass  IDMonth ClassName        nStudents

1                1                ClassA               30

1                2                 ClassA               25

2                 1                 ClassB              27

2                  2                ClassB               27

When i try to filter my data only to "Class A" in my chart the data will be aggregated instead of being separeted showing the values .