If I import an existing xlsx-file (Excel 2013) with a special Formatting and export it afterwards, the formatting is destroyed.
The file has its rows colored in different kinds of grey. After processing it, the colors are from dark blue to dark green. Seems like this depends on the brightness of the grey color of the original file.
If I use a standard Excel-Formatting, it is removed while processing.
What can be the reason for this behaviour?