Well, that's hard to answer with the information provided (i.e. lacking information about the data model, chart dimensions, expressions etc.).
Please double check that you don't have any selections in field Quarter when you are creating a chart with dimension Year, since the selections will affect the data aggregated in every chart (this is QV default behaviour).
You can clear selections in expression evaluation using set analysis, maybe this is the case in other charts you are looking at.
Anyway, without knowing more details about your settings, I think it's just wild guessing.