diff --git a/static/chart.js b/static/chart.js
index 002f4ef..fabbc37 100644
--- a/static/chart.js
+++ b/static/chart.js
@@ -3309,7 +3309,8 @@ class ConfluenceChart {
         Math.abs(bar.t - point.t) < Math.abs(nearest.t - point.t) ? bar : nearest
       ).t;
     this.contextLineId = level.id;
-    this.contextCutoff = cutoff > level.last_t ? cutoff : null;
+    const origin = Math.min(level.anchor_t, level.last_t);
+    this.contextCutoff = cutoff != null && cutoff > origin ? cutoff : null;
     this.contextEndButton.hidden = this.contextCutoff == null;
     this.contextExtendButton.hidden = level.cutoff_t == null;
     this.contextMenu.hidden = false;