Unable to load Semantic UI Navigation

Hello there, I am trying to use the Adobe XD UI kit for Design Systems and I am trying to use the same navigation from there. I got most of it working but for some reason when I open preview my pages does not scroll it just shows the whole page and all of them different in lenght so the page how it appears changes all the time and does not look consisten while clicking through different menu categoreis. 

Could you please let me know how to fix it? 

thank you,

Judita

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