@Krisztina Annamaria most conversion problems like broken TOC links and renumbered tables come from Word field or caption formatting being altered during export, or from using a PDF converter that doesn’t preserve Word’s internal hyperlinks and captions. To fix it, make sure every heading and caption in Word uses built-in styles and Word’s Insert Caption feature, update all fields and the TOC in Word before exporting, export using Word’s native Save As PDF or Acrobat’s PDFMaker add-in rather than printing to PDF, and verify that “Create bookmarks using” is set to Headings in the conversion options; if numbers still change, check for manual numbering in captions and convert them to automatic captions.