How can I fix the problem that the answers in a list of radiobuttons are at the right of the checkboxes instead of under them (please see example as attached)? Do I have to make a change in the template, and if so, what change do I have to make? I use Version 2.67.3. Thanks a lot!

That looks like it may be a template for a pre-2.5 version so there may be more problems than misplaced labels.

You would likely be best off to copy a shipped template and modify that.