diff --git a/crates/loro-core/src/container/text/text_container.rs b/crates/loro-core/src/container/text/text_container.rs
index 3073d925..9fc23671 100644
--- a/crates/loro-core/src/container/text/text_container.rs
+++ b/crates/loro-core/src/container/text/text_container.rs
@@ -192,11 +192,7 @@ impl Container for TextContainer {
         // stage 2
         // TODO: reduce computations
         let path = store.find_path(&self.head, &latest_head);
-        debug_log!("BEFORE CHECKOUT");
-        dbg!(&self.tracker);
         self.tracker.checkout(self.vv.clone());
-        debug_log!("AFTER CHECKOUT");
-        dbg!(&self.tracker);
         debug_log!(
             "[Stage 2]: Iterate path: {} from {} => {}",
             format!("{:?}", path.right).red(),
diff --git a/crates/loro-core/src/container/text/tracker.rs b/crates/loro-core/src/container/text/tracker.rs
index d6c69787..bed500d8 100644
--- a/crates/loro-core/src/container/text/tracker.rs
+++ b/crates/loro-core/src/container/text/tracker.rs
@@ -184,6 +184,7 @@ impl Tracker {
             let IdSpanQueryResult { inserts, deletes } = self
                 .id_to_cursor
                 .get_cursors_at_id_span(IdSpan::new(*span.0, span.1.start, span.1.end));
+
             for (id, delete) in deletes {
                 assert!(span.contains_id(id));
                 for deleted_span in delete.iter() {
diff --git a/crates/loro-core/src/container/text/tracker/cursor_map.rs b/crates/loro-core/src/container/text/tracker/cursor_map.rs
index 3c1a01d4..38e51750 100644
--- a/crates/loro-core/src/container/text/tracker/cursor_map.rs
+++ b/crates/loro-core/src/container/text/tracker/cursor_map.rs
@@ -260,7 +260,7 @@ impl CursorMap {
                 Marker::Delete(del) => {
                     if span.intersect(&id.to_span(del.len())) {
                         let from = (span.counter.min() - id.counter).max(0);
-                        let to = (span.counter.max() - id.counter).min(del.len() as Counter);
+                        let to = (span.counter.end() - id.counter).min(del.len() as Counter);
                         if to - from > 0 {
                             deletes.push((id.inc(from), del.slice(from as usize, to as usize)));
                         }
@@ -269,6 +269,12 @@ impl CursorMap {
             }
         }
 
+        if cfg!(test) {
+            let insert_len: usize = inserts.iter().map(|x| x.1.len).sum();
+            let del_len: usize = deletes.iter().map(|x| x.1.len()).sum();
+            assert_eq!(insert_len + del_len, span.len());
+        }
+
         IdSpanQueryResult { inserts, deletes }
     }