difference in size between saved plot and fig

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I do not understand why plots differ in terms of size and how they look when I try to save them or returnfig.

I generate plots of figsize (9,4) when I save them they look great, with a tight layout, no margins and axes excellent! But I need these plots again so it would be better to use a buffer instead. However, when I use the buffer resulting plot has a different size and added margins on one side.

The saved plot has size (365, 801, 1) while plot from the buffer (400, 900, 1).

I appreciate any suggestions how to use buffer but without adding margins.
Thank you

Reproduce the plot using figsize (9,4), first saving it and then retrieving it through a buffer with returnfig. Compare the resulting dimensions and margins, including the reported sizes (365, 801, 1) and (400, 900, 1). Done means the buffer result matches the saved plot without the added margins.

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