Draft modification

Hi,
I have a issue with a draft where some texte is missing.

It's about a page saved as "draft" and not modify since the begining of this year. I had to publish it, so I went on the page.
There is 2 pricing item and they are filled with "list item". Everything seems to be ok. I let the page for 10 / 15 min and when I come back I see that all the text in one of the 2 pricing item has disappaered... It was a page that I have not modified for months and now I can see "last modification: today". How can I resolve this to recover my text? It seems to be a bug. I didn't modify the text and I didn't save... But now one pricing item is empty...

Thanks.

Mike