Selecting from Link first fetch does not show data

I don’t know if I am the only one having this issue … everytime I lookup a dropdown it does not fetch the records, only when I delete one letter or whole and reselect again it fetches.
as you can see I fetch from “nome_service” the field “preco” and should return to preco_servico but it comes when debugging as "d.preco_servico undefined " and on d or item the field is not there but when I reselected the field shows.

The first image is my child table …when selected should return the Price.
The second image you can see that d.preco_servico does not show
The third image is after I delete the selected and type or select again it will return the field and the content.