Error trying to parse XML record. Invalid XML source

Hello team,
I have this issue:

What would the problem be? I am trying to submit the remaining 15 articles but it is not working.
Thank you

When do you get this error message @ncd_humansetting? Do you get it when loading a new empty survey form or when trying to open a saved form in Enketo?

When i try to open a saved from

Will I be able to retrieve these information or I have lost them and need to red0 them? Thank you

I tried to re-do one of them and got this message:

@ncd_humansetting, maybe you could clear the cache of your browser or even change your browser to some modern one? That should solve your issue.