The inputs for Adults and for Children appear in different order

Description of problem:

If the selected venue is Sydney Opera House, in section-choosing form the input fields for Adults and for Children appear in different order. If e.g. 'S1 - Front left' section is selected the Child input is shown first. If 'S7 - Balcony' is selected, the Adult input is shown first.

Version-Release number of selected component (if applicable):

WFK2 ER8
EAP6 CR1

How reproducible:

Always.

Steps to Reproduce:
1. package and deploy Ticket Monster example
2. select the Rock Concert event
3. select Sydney Opera House as a venue
4. click on 'Order tickets' button
5. choose different sections

Actual results:

For some sections, Child input is shown first, for other sections the Adult input is show first.

Expected results:

The inputs should show in the same order, regardless what section is selected.