1. Make Sure the Full Table Is Selected
If you sort only one column, the values in that column can move independently while related columns stay behind. Always click inside the table and sort the whole range. Better: convert the range to an Excel Table with Ctrl + T.
2. Remove Blank Rows Inside the Data
Blank rows can make Excel think the table ends early. If your bottom rows are not sorting, look for empty rows inside the dataset. Remove them manually or use the Remove Blank Rows tool.
3. Fix Dates Stored as Text
If dates sort alphabetically instead of chronologically, they are probably text. Convert the column to real dates using Text to Columns, Power Query, or a helper formula. Then sort oldest to newest again.
4. Fix Numbers Stored as Text
If numbers sort like 1, 10, 100, 2, Excel is treating them as text. Convert them to numbers before sorting. This is common after CSV imports.
5. Unmerge Cells
Merged cells often block sorting or produce strange results. Unmerge cells in the sort range and fill repeated values down if needed.
6. Check the Header Row
If Excel includes your header in the sort, enable My data has headers. If the first data row is being treated as a header, turn that option off.
7. Use a Browser Sort Tool for a Clean Copy
The Sort Excel Online tool can create a sorted copy of your workbook. It is useful when you want to keep the original file untouched and verify the output before using it.
Final Verification
After sorting, check several known records across the whole row. Customer names, IDs, dates, and amounts should still match. If anything looks mismatched, undo immediately and sort again from a clean copy.