Data Controls > Export - not exporting all the text in my chats, is this normal?

I wanted to create an export of all my chats with chatgpt(4) and went to the Settings > Data Control > Export. And got a zip file to download.

I find the resulting HTML file is very big, but some topics don’t have all the text present, its missing.
Some topics are fully present, some are not.

Is there anyway to ensure the export of every topic , all the text ?