diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2e2cf1b..944bffe 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,16 @@
 This changelog records public product changes. For the authoritative description
 of current runtime behavior, see [`docs/CURRENT-STATE.md`](docs/CURRENT-STATE.md).
 
+## [Unreleased]
+
+### Fixed
+
+- All three VIIRS sources now reach the Active Fires layer. Merging a source's
+  detections used argument spread, which exceeds the engine's argument limit on
+  the two largest sources and dropped them entirely — leaving roughly a third of
+  global detections while reporting each dropped source twice, once as
+  successful with its real count and once as failed.
+
 ## [0.1.0] — 2026-08-31 — One-click install, keyless boot, Provider Settings
 
 ### Added
diff --git a/vite.config.js b/vite.config.js
index 7887498..7a7e6c0 100644
--- a/vite.config.js
+++ b/vite.config.js
@@ -2086,7 +2086,10 @@ function firmsProxy() {
       try {
         const records = filterTrailing24h(await fetchSource(key, source), now);
         sources.push({ source, count: records.length, ok: true });
-        fires.push(...records);
+        // NOT fires.push(...records): spread passes each record as an argument,
+        // and a world/2 VIIRS pull exceeds V8's argument limit (~125k) at
+        // ~131k records — RangeError, and the whole source is silently dropped.
+        for (const record of records) fires.push(record);
       } catch (err) {
         console.warn(`[firms-proxy] ${source} fetch failed:`, err?.message || err);
         sources.push({ source, count: 0, ok: false });