Please check the “Name” Column and “Mon” “Mon OT” , “Tue” columns etc
the data was added in this format(Screenshot) In each column one value was filled rest all are zero
Click the first cell and press Shift while you click the last cell in the range you want to merge. Important: Make sure only one of the cells in the range has data. Click Home > Merge & Center. If Merge & Center is dimmed, make sure you’re not editing a cell or the cells you want to merge aren’t inside a table.