When grouping your markups, the order in which they are selected is very important. Hold ctrl+shift and then select the textboxes in the order you want the text to be displayed in the comments column, then group them. For example select X-225, then DG, then the circle, then the line, and then group. Now the text will display in that order in the comments column.
If you want them to appear in different columns you are better off creating two new custom columns (one for weld number and one for welder's stencil). Then when you export, these columns will appear in the CSV file.