Hi,
thanks for your question, and sorry for the trouble.
The reason for this basically is that these are separate tables, so that the browser calculates different widths for the columns (as the content in the tables is different).
You could simply manually set the widths with some CSS, see https://tablepress.org/faq/column-widths/
Also, please uncheck the “Use DataTables” checkbox on the “Edit” screens of these tables. As you are using the “colspan” feature in these tables, the DataTables JS library can not be used here (it’s incompatible with tables that use “colspan”).
Regards,
Tobias