Page updates are failing

I have one particular page (that is fairly large in size) within a site that I am building and it’s about 85% complete. I’ve been trying to add the last 15% of content and graphics to this page – I then save this work, refresh its URL to view the page, the page looks fine and shows the revisions correctly, then I go back in to do more edits and the changes I had just made and viewed are now gone. It fails to retain the changes I had made and reverts back to an older version from days ago.

From the start of creating this website I’ve been using Chrome but was having this issue of it not saving my revisions. I then installed and used Firefox with no plugins or add-ons and it still reverts back to an older version, which does not retain my revisions.

Any help or advice would be appreciated.

Thank you