"Comolun_2" is not the class name; it is column_2. (Yes, I assume this is a typo).
Did you set this as per this documentation: https://docs.machform.com/help/adding-columns-to-your-form
Add "column_2" to each field that you want to align in columns. For neatness, I'd advise using all lowercase for the class name (if you used "Column_2" and it doesn't work, try "column_2").
Note, the column function doesn't work on certain field types, as mentioned in the above documentation.