Examining the XML there appear to be bookmark entries against all the text entries on the initial page e.g.,
<text:h text:style-name="P17" text:outline-level="1">
<text:bookmark-start text:name="__RefHeading__1561_42739795"/>
KORPORATIVNA STRATEGIJA
<text:bookmark-end text:name="__RefHeading__1561_42739795"/>
</text:h>
How this has come about I cannot determine. Perhaps via the use of direct formatting, as there are many direct format styles in use, or it may be related to how the ToC was initially inserted. There certainly do not appear to be any visible bookmarks available when attempting to insert a cross-reference. These bookmarks are being picked up by the ToC. To fix the ToC problem (and leave the bookmarks):
- Right-click on the Table of Contents (ToC) > Edit Index/Table…
- On the Index/Table tab under the Create from section de-select Outline and select Additional Styles; Click the ellipsis (…) button beside this last option.
- On the Assign Styles dialog set the Heading 1 style to level 1 and Heading 2 style to level 2; Click OK.
- Click OK.
To fix the bookmarks and the ToC:
- Highlight all content prior to the ToC.
- From the Apply Style pull-down menu select “Clear Formatting”.
- Save the file under a new name.
- Close Writer.
- Re-open the file.
- Right-click on the Table of Contents (ToC) > Update Index/Table…
- Re-style the front page content as required (preferably using paragraph styles).