Data disappeared – iSpreadsheet™ : Office Sheets Review

Pretty good free little spreadsheet, but when I narrowed a column too much the data disappeared completely. Also when copying a "SUM" formula to a new column top and then adding data within that SUM range below it, the SUM did not change. Workaround was to delete and then restore the "close" parentheses in SUM formula, which served to refresh the new total.
Review by SaltRestricted on iSpreadsheet™ : Office Sheets.