Text disappears when ready to publish!

We’re experiencing some problems when we’re about to publish a page/ or a post. The thing is, something seems to be bothering wordpress because when you click on the “publish” button all of the text you have written, except a few words/ sentences, will disappear. This is very frustrating.

And yup, we have been looking around in this forum, but people with the same problem never seemed to have found the solution!

Does anybody have an idea why this happens and how you can fix it?

Thanks in advance,
Jennifer & Sara