Basically, it seems like the advice is to either use custom code to manage the selection of the correct radio buttons, or use a different control entirely such as pzGridRadioButton or a checkbox (with an activity that unchecks all others when a new one is selected).
Sure, but this is actually a pretty tricky design for anyone to get right, even Designer Studio - I believe one of the main issues is that this ends up being constructed as if each radio button is it's own group, instead of each button in the grid being in one group (which wouldn't be possible given how the repeat grid is generated).
From you screen shot, it appears you observe only one radio button of the three (or more) options available Option A, Option B , Option C. Could you please try the following and check if the issue is still reproducible
1. Enable "ROws alwys editable" on your grid's operation settings. This should help show all the values
2. . Configure On Change + refresh on the Radio button and check if the issue is reproducible ?