Radiobuttons do not behave correctly: GroupBoxes have no effect; RB selection jumps from one GB to another

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FMX, C++Builder community: I have a big problem with TRadioButtons and TGroupBox. I have a form with 2 (or more) TGroupboxes, in which I placed several TRadioButtons each. I can only have 1 (one) selected at a time (design mode and/or run mode), and the selected radiobuttons states jumps from one TGroupBox to another ... I spent hours and days to figure out what could be the reason; nothing. Started several new test projects (FMX), and the same happens. Impossible to select several buttons from different group boxes. Everything happens like if I have NO groupbox in the form. Any idea ? Do I have missed something ? Or re-install ? many thanks.

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