As a temporary fix, remove or put a space in between any "< 3" or "< 4" you've included in your guide. Placing any character after a < without a space in between causes the issue you're running into, which is something I'm told the devs are aware of ;)
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It seems that the site cut some of the text my guide used to have...
Link: My guide
At least it cut off some text for me... I have the full copy of my guide's code and I tried pasting it and again saving and publishing but still the same. Why it cut off some text? I mean at the bottom. It used to be the "Back to table of contents" button and the animated gif, milestones etc. Now there is just a part of the change log... It used to be bigger. What's happening?