Number Format Settings have been lost during upgrade...
...from QV9SR7 to QV11SR1.
The field in original application (created in QV9) had been set to Fixed Number Format with 2 decimals (Document Properties/Number). When QVW had been opened with QV11SR1, data representation of this field appeared to be different in list boxes and charts. Under Document Properties/Number this field had been found set to Mixed!!!
Surely, I can fix it manually, but I would like to understand the reason behind that behavior of QlikView, and to find more elegant solution, rather than check and reset all the fields, and reload every application I need to bring to order. The data have been pulled from the same data source, but QV9 and QV11 versions of software are located on the different servers.