Hi @sumankhanal,
Welcome to the community! Seems like you have some coding error within your xlsform. I tried at my end with the information you provided and i got it correct. For details, please see the images below:
In the survey tab of your xlsform:
In the choices tab of your xlsform: Please note, you may not see all the choices in the image as i have hidden it to save space. But you should find all the choices in the reference xlsform shared at the end of this post.
Data entry screen as seen in Enketo:
Reference xlsform:
Cascading Select (Local Level Nepal).xlsx (16.8 KB)
For further reading, please visit our support article on cascading select here.
Have a great day!