I think I’m having sort of the same problem when I try displaying six columns, the sixth column is put on the next line. I have tried with both picture as content and text, but the result is still the same.
[su_row]
[su_column size="1/6"]Part 1[/su_column]
[su_column size="1/6"]Part 2[/su_column]
[su_column size="1/6"]Part 3[/su_column]
[su_column size="1/6"]Part 4[/su_column]
[su_column size="1/6"]Part 5[/su_column]
[su_column size="1/6"]Part 6[/su_column]
[/su_row]