Change group order
From LimeSurvey Manual
Reorder groups by clicking on the Change group order icon in the survey toolbar.
If you have a survey with more than one group, the groups are displayed according to this group order. That is why you may to have to reorder the groups. You can do that by simply click on the 'Up' and 'Down'-buttons.
If you set conditions on question the particular condition might prevent re-ordering a group before/after another group. In that case you will have to delete the particular condition(s) first.