Hidden fields not aligning properly

What do I have to do with another 2 fields?

Fields are displayed that way because they are shrink and because fields that can be shown based on selection from "Fecha de recogida" field are hidden. This is normal behavior. If field is hidden other field will take his place. 

As possible workaround you can add empty Text field to your form, shrink it and set width of that field with CSS to 380px.

I added this CSS code for my Text field.

#id_191 {

    width : 380px !important;

}

Then you will need to set conditions for that Text field to be shown when Options: En una semana, Soy flexible, Todavía no tengo una fecha are selected or when field is empty. 

You can set you condition like this. 

This should be the result.

Here is my demo form: https://form.jotform.com/63452876801966 

Feel free to test it and clone it.

Hope this will help. Let us know if you need further assistance.