Zoho Campaigns reverts to old version

Zoho Campaigns suddenly reverts to an old version sometimes when i am opening up again/ I have been using Campaigns for over 12 months and never had this problem until last week.

I have attached a screenshot of the test email that was sent (after correcting an old cloned version and saving), then a screen shot of when I went back in to edit one minute later and it had reverted to an old version even though the correct version was saved.

Is there a bug with Zoho Campaigns?