QCombobox last item become inaccessible when a listview is used in popup

There is a problem with showing content of the QComboBox . Please refer to the attached sample. There is one ComboBox just at the top of the form. It contains 5 values: "NO_AAA" << "GREEN" << "YELLOW" << "SUSTAINABLE" << "OTHER_AAA";
When the form is shown the size of the ComboBox is greater then the largest item of the list. There are shown all 5 items (see picture_1.png). Then when resize the form to be narrowed as possible and roll out the CB then there are seen only four of them - the last is missing (see picture_2.png). Then when the form is again resized - just a bit - and roll out the CB again all five items are seen again.