Nested_repeat_groups

I found a problem regarding nested repeats, whenever I select options no for questions Q15. Birth?, there arise a problem for the next repeating member in the inner repeat in the child_section_exists, some time its not showing the nested questions for child section exists even if I select the option yes, So Can anyone can help me? or give me any suggestions regarding this issues? Here, I have attached the XLSForm.

Welcome to the community, @Monika! Maybe validate your XLSForm through the online validator to see if it helps you identify the issue.

I have checked the form but haven’t identified the problem for which inner iterations had connected for the response of previous outer iterations. Do you have any other solutions?