This may have nothing to do with the problem, but you could try it.
I had an issue with the main site and a cloned practice site being under the same URL:
mainsite.com and mainsite.com/demo.
The sites were identical other than for the databases and database passwords. I noticed that if I made changes on the cloned site, those changes sometimes appeared in the main site as well. It was mainly to do with adding or removing photos, but not always.
I wrote about it here and nobody could offer any assistance, other than to say it shouldn't happen.
I eventually began to believe it had something to do with cookies which Dolphin uses. It also seemed to be when I was logged in to both sites at the same time. Once I made a habit of logging out of one site before logging into the other, the problem stopped.
I did notice that I was unable to log out of the cloned site if I was logged in to the main one and that's when I suspected the cookies may be at fault. To overcome the problem, I had to log out of the main site, go back to the demo site and log out, then log in on the main site again.
May I suggest you make sure you're logged out of the demo site, open the main site, clear the cache, your site cookies and your site cache using your browser. Then refresh the browser. That's four separate things. If it still persists, something else is obviously amiss.