A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data
Hello,
From the screenshots, the clearest formatting change is the fill color of the data series. However, if both screenshots show the same chart before and after reopening, some data labels also appear to change, for example from 57.87 to 28.94. In that case, the issue may involve both the chart formatting and its source data.
Please first test the following in a copy of the workbook:
- Select the affected series, right-click it, and choose Format Data Series.
- Under Fill & Line > Fill, select Solid fill.
- Choose More Colors > Custom and specify a fixed RGB color. If Vary colors by point is available, make sure it is not selected.
- Repeat this for the line or markers if their formatting also changes. Microsoft documents the available chart formatting options here: Change the shape fill, outline, or effects of chart elements.
- Use File > Save As and save a test copy as an Excel Workbook (.xlsx). If the workbook contains macros, retain the .xlsm format instead. Other formats may not preserve all Excel formatting and features: File formats that are supported in Excel.
- Close all Excel windows, then reopen the test copy.
If the same issue continues, please create a new blank .xlsx workbook, insert a small test chart, apply a custom color, save it, and reopen it. This will help determine whether the behavior is limited to this workbook or also occurs in newly created files.
If the chart values also change after reopening, please let me know whether this is a regular chart or a PivotChart, and whether its source data uses formulas, external links, Power Query, or macros.
Please also provide:
- The current file extension
- The full Excel version and build shown under File > Account > About Excel
- Whether the file is saved locally or in OneDrive/SharePoint
- The result of the new blank-workbook test