problem with my Graphs ?

First suggestion: a more detailed title might help draw people's interest in the topic. Almost any question about charts in Excel could be titled "problem with graphs". A more descriptive title would draw those in with the desired expertise to view your topic.

2nd suggestion: A sample file illustrating your problem will likely be necessary. Coming up with a solution is going to require understanding how and when your charts are created, how the spreadsheet is arranged, and other details.

Most of the time, when I create multiple charts on the same sheet, Excel automatically puts those charts on top of each other. It is like Excel's "default" chart position is always the same, unless I somehow "move" the chart after it is created. The "so obvious it is not really helpful" solution to this is to move each chart to its desired location after it is created. Exactly how to accomplish that will depend greatly on how and when the charts are created.