Hi!
It’s most likely that the content is stored within different HTML tags, that are allowed and there might be a syntax error (most likely unclosed html) causing the content to completely disappear.
You should try to allow more tags on the Advanced Options -> HTML Tags exclude from stripping content option. Currently you can see a,abbr,span,b tags as non stripped. Try to add div and p as well, those are common ones.
So the final options should look like this: [code]<span><a><abbr><b><p><div>[/code]
And of course the Run shortcodes found in post content should be enabled and the Strip shortcodes from post content should be disabled.