Alan, the "some columns sort, others don't" symptom is almost always mixed data types - specifically numbers stored as text sitting alongside real numbers in the same column. LibreOffice Calc won't sort those together correctly. Quick way to check: click a cell in the problem column that should be a number. Look at the bottom status bar. If it shows Sum: 0 or Count: 1 instead of the actual value, that cell contains a text-number. To fix it, select the affected column, go to Data > Text to Columns, then just click OK/Finish without changing anything. That forces Calc to re-evaluate all cells in the column as proper numbers. After that the sort should work fine. Also worth checking for merged cells anywhere in your data range. Even one merged cell will silently block sorting for that whole area. Go to Format > Merge Cells > Unmerge Cells on the selection to rule that out.