Menu not displaying all links

I am working on the Bulgarian version of this website. I was not the one creating it. While modifying some things on the pages, I noticed that not all pages are being displayed in the menu, so I went to add them. In the end it turned out that they were already added. After moving some pages to higher position I noticed that only the first 4 pages are showing. Then I debugged the website and with very flow wifi I saw that the links are showing while the website is still loading, but then something is causing them to disappear. Interestingly enough when loading the mobile version of the Website no such mistake exists. I checked styles, checked functions, but nothing seems to be causing this. I pasted code in GPT to look for anything related, but he found nothing at all. Any idea what could be causing this?

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