diff --git a/apps/web/cypress/e2e/recipes.ts b/apps/web/cypress/e2e/recipes.ts
index 9af2311..5acf3ee 100644
--- a/apps/web/cypress/e2e/recipes.ts
+++ b/apps/web/cypress/e2e/recipes.ts
@@ -100,7 +100,15 @@ When("I choose {string} as the correct technique", (label: string) => {
 });
 
 Then("the correction request should have been made", () => {
-  cy.wait("@correction");
+  // Asserts the actual span, not just that *a* request fired — a real bug
+  // (StepDescription.tsx's click handler reading a shared, still-mutating
+  // `offset` variable by reference instead of a value captured at render
+  // time) once sent `end` all the way to the end of the description
+  // instead of "Cuire"'s own tight [0, 5) span, and a request-fired-only
+  // assertion here didn't catch it — found only via manual testing.
+  cy.wait("@correction")
+    .its("request.body")
+    .should("deep.include", { start: 0, end: 5, previousTechStepId: 1 });
 });
 
 Then("the recipe {string} should not be visible in the table", (name: string) => {
diff --git a/apps/web/src/features/recipes/steps/StepDescription.tsx b/apps/web/src/features/recipes/steps/StepDescription.tsx
index fd1ccdc..b37100a 100644
--- a/apps/web/src/features/recipes/steps/StepDescription.tsx
+++ b/apps/web/src/features/recipes/steps/StepDescription.tsx
@@ -92,6 +92,14 @@ export function StepDescription({
         {segments.map((segment, index) => {
           const start = offset;
           offset += segment.text.length;
+          // Captured now, not read as `offset` later inside a click
+          // handler below — `offset` keeps mutating for every subsequent
+          // segment this same `.map()` pass renders, so a closure
+          // referencing it directly would see its *final* value (the end
+          // of the whole description) whenever it actually fires, long
+          // after render — found via a real correction submitted with
+          // `end` far past this segment's own text.
+          const end = offset;
           // A segment's own text/techStep don't uniquely identify it (the
           // same word can appear twice in one description) — index is the
           // only thing that does, but this list is fully regenerated from
@@ -130,7 +138,7 @@ export function StepDescription({
                   editable
                     ? () =>
                         setActiveCorrection({
-                          range: { start, end: offset },
+                          range: { start, end },
                           selectedText: segment.text,
                           previousTechStepId: techStep.id,
                         })