Table displaying <flask_table.columns.Col object at ...> when there are more 2 nested tables

[yipy0010]

Hi, I was using the simple_nested.py as a template and wanted to have 4 nested tables. There were no errors except that the strings in nested tables 3 onwards display <flask_table.columns.Col object at...> instead of the intended string. How can I resolve this issue?

Thanks. :)