How to Adjust Row Heights and Column Widths in Excel
When you begin working on a spreadsheet, all the rows and columns are the same size. As information is entered into the worksheet, some of the columns or rows may not be large enough to display the information they contain.
When you see ##### in a cell, it means the column width is not wide enough to show all the cell contents. Once the column width is adjusted, and the data will reappear.