Using the comma as a decimal separator in multiple argument functions confuses KmPlot parser.
BUG: 267203
https://bugs.kde.org/show_bug.cgi?id=267203
On the other hand, it is natural to separate numbers with comma separator using the comma with space, e.g. "(0,5, 0,5)", so it is enough to replace the "<number>,<number>" sequences with "<number>.<number>" to obtain the correct results.