diff --git a/renderer.go b/renderer.go
index 4fc872e..04174db 100644
--- a/renderer.go
+++ b/renderer.go
@@ -204,13 +204,14 @@ func (r *renderer) insertTop(lines []string, topBoundary, bottomBoundary int) {
 	r.mtx.Lock()
 	defer r.mtx.Unlock()
 
+	topBoundary += 1
 	b := new(bytes.Buffer)
 
 	saveCursorPosition(b)
 	changeScrollingRegion(b, topBoundary, bottomBoundary)
 	moveCursor(b, topBoundary, 0)
 	insertLine(b, len(lines))
-	_, _ = io.WriteString(b, "\r\n"+strings.Join(lines, "\r\n"))
+	_, _ = io.WriteString(b, strings.Join(lines, "\r\n"))
 	changeScrollingRegion(b, 0, r.height)
 	restoreCursorPosition(b)
 
@@ -230,6 +231,7 @@ func (r *renderer) insertBottom(lines []string, topBoundary, bottomBoundary int)
 	r.mtx.Lock()
 	defer r.mtx.Unlock()
 
+	topBoundary += 1
 	b := new(bytes.Buffer)
 
 	saveCursorPosition(b)