When chart area bitmap fill is tiled in Calc, the size of a tile depends on chart width and height. However theese properties are not explicitly given in Excel code. There is only position (in col/row number plus col/row offset) of top-left and bottom-right corner of the frame in drawing.xml file.
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Because of that also chart-wall border width can be shown incorrectly.
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After double-clicking on the chart display is corrected.
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Size of chart titles are also affected.