diff --git a/docs/The-Menagerie.md b/docs/The-Menagerie.md
index 4a00d6f4b..c8093bb9e 100644
--- a/docs/The-Menagerie.md
+++ b/docs/The-Menagerie.md
@@ -8,7 +8,7 @@ featured:
   element: '<big-image imgsrc="/public/templates/risk-first/posts/book-grey.png" />'
 tags: 
  - Front
-order: 4
+sidebar_position: 3
 ---
 
 # The Menagerie
diff --git a/docs/bets/Start.md b/docs/bets/Start.md
index 00a470982..7925d2196 100644
--- a/docs/bets/Start.md
+++ b/docs/bets/Start.md
@@ -11,6 +11,7 @@ cat: Bets
 tags:
  - Front
 tweet: yes
+sidebar_position: 4
 ---
 
 # On Bets
diff --git a/docs/complexity/Start.md b/docs/complexity/Start.md
index 34a6d6046..43d7dbc76 100644
--- a/docs/complexity/Start.md
+++ b/docs/complexity/Start.md
@@ -10,7 +10,7 @@ layout: categories
 cat: Complexity
 tags:
  - Front
-sidebar_position: 7 
+sidebar_position: 6
 tweet: yes
 ---
 
diff --git a/docs/estimating/Start.md b/docs/estimating/Start.md
index 455e637f9..96c50cab9 100644
--- a/docs/estimating/Start.md
+++ b/docs/estimating/Start.md
@@ -10,6 +10,7 @@ cat: Estimating
 tags:
  - Front
 tweet: yes
+sidebar_position: 5
 ---
 
 # On Estimating 
diff --git a/docs/presentations/Start.md b/docs/presentations/Start.md
index 294bb73a1..4222db591 100644
--- a/docs/presentations/Start.md
+++ b/docs/presentations/Start.md
@@ -10,7 +10,7 @@ layout: categories
 cat: Presentations
 tags:
  - Front
-sidebar_position: 8 
+sidebar_position: 7
 tweet: yes
 ---
 
diff --git a/docs/risks/Start.md b/docs/risks/Start.md
index 1146b0de5..68ef7a120 100644
--- a/docs/risks/Start.md
+++ b/docs/risks/Start.md
@@ -7,7 +7,7 @@ cat: Risks
 featured: 
   class: bg1
   element: '<image-artifact imgsrc="/public/templates/risk-first/posts/dictionary.svg">Track 3: Risks</image-artifact>'
-sidebar_position: 4
+sidebar_position: 3
 tags:
   - Front
 tweet: yes
diff --git a/src/components/FillTheBucket2/index.js b/src/components/FillTheBucket2/index.js
index 9436f314c..9a04454ec 100644
--- a/src/components/FillTheBucket2/index.js
+++ b/src/components/FillTheBucket2/index.js
@@ -79,6 +79,7 @@ const chart1 = (model) => {
 
 	return {
 		type: 'bar',
+		id: "1",
 		data: {
 			labels: range(0, 20, 1),
 			datasets: [{
diff --git a/src/components/KitchenCabinet1/index.js b/src/components/KitchenCabinet1/index.js
index 0776a7e88..de6335dff 100644
--- a/src/components/KitchenCabinet1/index.js
+++ b/src/components/KitchenCabinet1/index.js
@@ -55,6 +55,7 @@ const chart1 = (model) => {
 
 	return {
 		type: 'bar',
+		id: "1",
 		data: {
 			labels: [...range(0, model.time.value, 1), model.time.value + "+"],
 			datasets: [{
@@ -68,11 +69,11 @@ const chart1 = (model) => {
 		options: {
 			maintainAspectRatio: false,
 			scales: {
-				y: [{
+				y: {
 					ticks: {
 						beginAtZero: true
 					}
-				}]
+				}
 			}
 		}
 	}
diff --git a/src/components/KitchenCabinet2/index.js b/src/components/KitchenCabinet2/index.js
index 5c8e82b5f..123cb5590 100644
--- a/src/components/KitchenCabinet2/index.js
+++ b/src/components/KitchenCabinet2/index.js
@@ -31,6 +31,7 @@ const chart1 = (model) => {
 
 	return {
 		type: 'line',
+		id: "1",
 		data: {
 			labels: range(0, 20, 1),
 			datasets: [{
@@ -47,11 +48,11 @@ const chart1 = (model) => {
 		},
 		options: {
 			scales: {
-				y: [{
+				y: {
 					ticks: {
 						beginAtZero: true
 					}
-				}]
+				}
 			}
 		}
 	}
diff --git a/src/components/KitchenCabinet3/index.js b/src/components/KitchenCabinet3/index.js
index 7596d2d9d..9880defd2 100644
--- a/src/components/KitchenCabinet3/index.js
+++ b/src/components/KitchenCabinet3/index.js
@@ -38,6 +38,7 @@ const chart1 = (model) => {
 
 	return {
 		type: 'line',
+		id: "1",
 		data: {
 			labels: range(0, days, 1),
 			datasets: [{
@@ -54,11 +55,11 @@ const chart1 = (model) => {
 		},
 		options: {
 			scales: {
-				y: [{
+				y: {
 					ticks: {
 						beginAtZero: true
 					}
-				}]
+				}
 			}
 		}
 	}
@@ -70,6 +71,7 @@ const chart2 = (model) => {
 
 	return {
 		type: 'line',
+		id: "2",
 		data: {
 			labels: range(0, days, 1),
 			datasets: [{
@@ -88,11 +90,11 @@ const chart2 = (model) => {
 		},
 		options: {
 			scales: {
-				yAxes: [{
+				y: {
 					ticks: {
 						beginAtZero: true
 					}
-				}]
+				}
 			}
 		}
 	}
@@ -106,6 +108,7 @@ const chart3 = (model) => {
 
 	return {
 		type: 'line',
+		id: "3",
 		data: {
 			labels: range(0, days, 1),
 			datasets: [{
@@ -118,11 +121,11 @@ const chart3 = (model) => {
 		},
 		options: {
 			scales: {
-				yAxes: [{
+				y: {
 					ticks: {
 						beginAtZero: true
 					}
-				}]
+				}
 			}
 		}
 	}
@@ -138,6 +141,7 @@ const chart4 = (model) => {
 
 	return {
 		type: 'bar',
+		id: "4",
 		data: {
 			labels: ['Too Early', 'Too Late', 'Total'],
 			datasets: [{
@@ -150,11 +154,11 @@ const chart4 = (model) => {
 		},
 		options: {
 			scales: {
-				yAxes: [{
+				y: {
 					ticks: {
 						beginAtZero: true
 					}
-				}]
+				}
 			}
 		}
 	}
diff --git a/src/css/custom.css b/src/css/custom.css
index 614b82001..8c63b2704 100644
--- a/src/css/custom.css
+++ b/src/css/custom.css
@@ -79,4 +79,11 @@
 
 .credits {
 	opacity: 0.5;
+}
+
+/**
+ * Hide duplicated math formula 
+ */
+.katex-html {
+	display: none;
 }
\ No newline at end of file
diff --git a/src/theme/TagList/index.js b/src/theme/TagList/index.js
index fb8d61db9..fb03bd6f1 100644
--- a/src/theme/TagList/index.js
+++ b/src/theme/TagList/index.js
@@ -52,7 +52,7 @@ export default function TagList(props) {
 				oneTag
 					.filter(d => d.permalink.indexOf(filter) > -1)
 					.filter(d => d.permalink != location)
-					.map(d => <DocItemImage key={d} doc={d} />)
+					.map(d => <DocItemImage key={d.permalink} doc={d} />)
 			}
 		</div>
 	);