Value/index error of list in Firebase

I’m trying to create a list of contacts app and I need to sort them. But, when I use “char_afanumérico” it always gets the last value of the list “ordem_afanumérico”. How do I fix this?

ListAdd on Extension is discontinued and may give error.

Try this latest one

(ListAddon) I use it often, it is a list manager, it does not require anything special and it does its job without problems