Onchange of the autocomplete you can set the value for the other autocomplete and refresh the section.
Generally the Auto complete control will refresh the section when you try to enter something or pressing the down arrow key in order to fetch the results in autocomplete field, which is an expected behavior. If you don’t want your whole section to be reloaded then its suggested to place your autocomplete field in separate section, so that it will reload only that section instead of reloading the main section.