ATF Set Component Values (Custom UI) not working on Select Box

Hello testers,

im was creating a new test where i need to open a Custom UI wich has a form, populate required fields and send it. For some reason theres some of the fields that are not been populated, and those fields are all Select Boxes. I also tried to first click the box and then click the option but is not working either. 

Some help would be very helpfull, thank you so much.