F1 jumps to different position of doc each time it is pressed

When I select a Qt class, e. g. QGridLayout, in Creator's cppeditor and press F1, the help page associated with the class is being opened. On this page, the first occurrence of the string "QGridLayout" is shown. If I close the help page and press F1 again, the second occurrence is shown. Each time I repeat this, the help page scrolls down a little more.

Instead, pressing F1 on a class should always show exactly the same position of the documentation.