diff --git a/manifest.firefox.json b/manifest.firefox.json
index afb3c1c..27d0ca1 100644
--- a/manifest.firefox.json
+++ b/manifest.firefox.json
@@ -1,7 +1,7 @@
 {
   "manifest_version": 3,
   "name": "Silent Send",
-  "version": "2.0.0",
+  "version": "2.0.3",
   "description": "Intercepts personal info and substitutes it with user-defined replacements before sending to AI services.",
   "browser_specific_settings": {
     "gecko": {
diff --git a/manifest.json b/manifest.json
index efe7a11..034e60e 100644
--- a/manifest.json
+++ b/manifest.json
@@ -1,7 +1,7 @@
 {
   "manifest_version": 3,
   "name": "Silent Send",
-  "version": "2.0.0",
+  "version": "2.0.3",
   "description": "Intercepts personal info and substitutes it with user-defined replacements before sending to AI services.",
   "permissions": [
     "storage",
diff --git a/package.json b/package.json
index 74b78c5..a203aae 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "silent-send",
-  "version": "2.0.0",
+  "version": "2.0.3",
   "private": true,
   "license": "BSL-1.1",
   "description": "Browser extension that substitutes personal data before sending to AI services",
diff --git a/src/content/content.js b/src/content/content.js
index 7ea70b1..10fa4a7 100644
--- a/src/content/content.js
+++ b/src/content/content.js
@@ -661,7 +661,11 @@
     // Record what was actually substituted so reveal knows
     for (const r of replacements) {
       if (r.replaced && r.original) {
-        sessionSubstitutions.set(r.replaced.toLowerCase(), r.original);
+        // Store with lowercase key for lookup, but preserve original case
+        sessionSubstitutions.set(r.replaced.toLowerCase(), {
+          original: r.original,
+          replaced: r.replaced,  // preserve original case
+        });
       }
     }
 
@@ -1272,7 +1276,8 @@
     // Helper: only add if this substitute was actually sent
     function addIfUsed(from, to, caseSensitive) {
       if (!from || !to) return;
-      if (sessionSubstitutions.has(from.toLowerCase())) {
+      const entry = sessionSubstitutions.get(from.toLowerCase());
+      if (entry) {
         pairs.push({ from, to, caseSensitive });
       }
     }
@@ -1301,9 +1306,9 @@
     }
 
     // Also add auto-detect and secret scanner substitutions from this session
-    for (const [replaced, original] of sessionSubstitutions) {
-      if (!pairs.some(p => p.from.toLowerCase() === replaced)) {
-        pairs.push({ from: replaced, to: original });
+    for (const [key, entry] of sessionSubstitutions) {
+      if (!pairs.some(p => p.from.toLowerCase() === key)) {
+        pairs.push({ from: entry.replaced, to: entry.original });
       }
     }
 
diff --git a/src/options/options.html b/src/options/options.html
index ad41502..abe7481 100644
--- a/src/options/options.html
+++ b/src/options/options.html
@@ -589,7 +589,7 @@
     </section>
 
     <footer>
-      <p>Silent Send v2.0.0</p>
+      <p>Silent Send v2.0.3</p>
     </footer>
   </div>