diff --git a/components/model/fence.vue b/components/model/fence.vue
index 608cb29..34d0277 100644
--- a/components/model/fence.vue
+++ b/components/model/fence.vue
@@ -22,9 +22,10 @@ const show_pillar_one = ref(props.index == 1)
 const show_pillar_two = ref(true)
 
 const last_element = ref(Math.min((section_count.value + ~~(!!extra_section.value)), max_size.value))
-watch([section_count, extra_section], () => {
+watch([section_count, fence_section, extra_section], () => {
     last_element.value = Math.min(section_count.value + ~~(!!extra_section.value), max_size.value)
 })
+
 const getExtraValue = () => (extra_section.value && props.index == last_element.value) ? extra_section.value * 0.001 : false
 const extra = ref(getExtraValue())
 if (extra.value) {
@@ -41,7 +42,6 @@ const make_translate_to_section = (source = fence_section.value) => {
     return r
 }
 const translate_to_section = ref(make_translate_to_section())
-
 watch([fence_section, extra], () => {
     translate_to_section.value = make_translate_to_section()
 })