Chart in chart size problem

Hello,

I use 3 pivot charts.
1 I have located in a chart tab and that one fills the sheet totally (as normal)
2 others I have located in the same chart tab but as smaller charts just under the title of chart 1

What happens is that the smaller ones, which I have set to a certain size to fit the above corners of chart 1 nicely, resize to smaller charts when I save the file.
I have tried blocking the charts, mark the option not to resize the chart, and marked the option to stick to the set ratio..... nothing helps.
What I do doesn't matter, after saving the small charts change to even smaller than I have set and saved them.

Anyone know what to do?

I have schreenshots in the attachment

Thanks