diff --git a/src/webui/data/analysis.py b/src/webui/data/analysis.py
index 155ece0..71c30cd 100644
--- a/src/webui/data/analysis.py
+++ b/src/webui/data/analysis.py
@@ -559,6 +559,12 @@ def _compute_timeline_animation_data(db: Database) -> dict:
             "month": month,
         })
 
+    # Deliver points in chronological order so the front-end's cumulative
+    # filter (p.month <= frame) is append-only.  Otherwise new points get
+    # inserted mid-array and Plotly's index-based frame transition animates
+    # existing markers flying to other drafts' coordinates ("jumping points").
+    points.sort(key=lambda p: (p["month"], p["name"]))
+
     months = sorted(month_set)
     # Convert defaultdict to plain dict for JSON
     cat_monthly_plain = {m: dict(cats) for m, cats in category_monthly.items()}