Nested UITableViews first tap issue

I've got a main UITableView with other UITableViews within its UITableViewCells.

The main table is not selectable. The inner tables are (single selection).

The issue: it works absolutely ok after the first tap, but does not work in that first tap. If that tap pushes another View Controller, if I then go back to the table, it works again, but some scrolling leads it to the wrong behavior again.

Any hint? Any idea on how to build nested tables successfully?

Thank you all in advance.