Components are overlapping eachother

[andreluisos]

local function render_component()
  return n.tabs(
    { active_tab = _signal.active_tab },
    render_main_title(),
    n.tab(
      { id = "category" },
      n.rows(
        render_field_category_selector(),
        render_next_button()
      )
    ),
    n.tab(
      { id = "field" },
      n.rows(
        render_field_component(),
        n.gap(1)
      ),
      n.rows(
        n.columns(
          render_previous_button(),
          render_confirm_button()
        )
      )
    )
  )
end

renderer:render(render_component())

I can't understand why, but render_confirm_button and render_previous_button are being rendered behind render_field_component. Could someone help me out?