diff --git a/src/epub_converter/epub_converter.py b/src/epub_converter/epub_converter.py
index 57f2904..ae900ea 100644
--- a/src/epub_converter/epub_converter.py
+++ b/src/epub_converter/epub_converter.py
@@ -104,8 +104,8 @@ class EpubConverter:
         self.add_not_added_files_to_adjacency_list(not_added)
         self.logger.log(f"Html internal links and structure processing.")
         self.label_chapters_ids_with_lc_id()
+        self.chapter_marks_are_same_level()
         # used only after parsed toc, ids from toc needed
-        self.process_html_soup_structure_to_line()
         self.process_internal_links()
         self.logger.log(f"Define chapters content.")
         self.define_chapters_content()
@@ -316,11 +316,24 @@ class EpubConverter:
                 new_h.attrs["id"] = i
                 tag.insert_before(new_h)
 
-    def process_html_soup_structure_to_line(self):
-        # go to line structure
+    def chapter_marks_are_same_level(self):
+        """
+        Function checks that marks for pointing a start of a chapter are placed on one level in html tree.
+        Mark is tag with "class": "converter-chapter-mark". Added while TOC was parsed.
+        This tag must have a chapter_tag as a parent.
+        Otherwise, it is wrapped with some tags. Like:
+        <p> <span id="123", class="converter-chapter-mark"> </span> </p>
+
+        """
         for html_href in self.html_href2html_body_soup:
-            soup = self.html_href2html_body_soup[html_href]
-            self.html_href2html_body_soup[html_href] = process_structural_tags(soup)
+            chapter_tag = self.html_href2html_body_soup[html_href]
+            # check marks for chapter starting are on the same level - 1st
+            marks = chapter_tag.find_all(attrs={"class": "converter-chapter-mark"})
+
+            # fix marks to be on 1 level
+            for mark in marks:
+                while mark.parent != chapter_tag:
+                    mark.parent.unwrap()  # todo warning! could reflect on formatting/internal links in some cases
 
     @staticmethod
     def create_unique_id(href, id_):