Although it may appear to be a Geeklog issue, I am fairly certain that this is not the case.
I have observed many times that when the word count in a story is near or above 1,800 words previewing the story before saving is difficult. You probably have observed that the story editor will accept stories greater than 1,700 and other times during story preview it appears that it will not. The overflow or missing parts of the story appears after the "Post mode" section.
My non-technical workaround, when a story's word count is at or above 1,800 words or will not preview correctly, I simply use the back button in the browser and save the story without preview. Geeklog will always save and display the story correctly.
I have not found what is overflowing and is not complainting when I observe the story preview overflow. Hope this helps
Frlitz