diff --git a/src/epub_converter/epub_converter.py b/src/epub_converter/epub_converter.py
index 5f08814..6181d80 100644
--- a/src/epub_converter/epub_converter.py
+++ b/src/epub_converter/epub_converter.py
@@ -214,7 +214,7 @@ class EpubConverter:
 
             sub_nodes = []
             for elem in second:
-                if 'section' in first.title.lower() or 'part' in first.title.lower():
+                if ('section' in first.title.lower() or 'part' in first.title.lower()) and lvl == 1:
                     self.offset_sub_nodes.append(self.build_adjacency_list_from_toc(elem, lvl))
                 else:
                     sub_nodes.append(
@@ -510,7 +510,7 @@ if __name__ == "__main__":
 
     logger_object = BookLogger(name=f'epub', main_logger=logger, book_id=0)
 
-    json_converter = EpubConverter('../../epub/9781641050234.epub',
+    json_converter = EpubConverter('../../epub/9781634254878.epub',
                                    logger=logger_object)
     tmp = json_converter.convert_to_dict()