Weird behaviour with JSON AJAX data loading

[robri...@gmail.com]

Hello,

I am experiencing problems by loading options with AJAX.

I'm getting a weird behaviour upon selecting an option: it won't let me choose any other one, plus it acts as if I already used all options (already selected, so they are disabled).

P.D: The select field is not "multiple".

Image of what I'm talking about: https://i.gyazo.com/9e082612d53cea8343997fb60aea3ce0.png

Thanks.