Just in case...
2 days ago, I made an edit on Erik page, and later I was notified that while doing my edit, I removed an edit made by Erik 2 hours sooner than I. I had no edit conflict. I did not see Erik edit on his page when I edited it.
Yesterday, the same thing happened to Patrick with another person edit, just made a couple of minutes sooner. He erased it without knowing.
Also, I frequently had in the past couple of days notification of new messages. Then, I went on my talk page, and saw nothing new. I went in history and saw someone edited it. I have to reload the page to see the message apppear.
I suppose these three cases are all cache problems. With the cache also on the edit window. But why recently ? Has this been noticed by others ?
PS : this is embarassing, because some editors may believe the removal of text was done on purpose :-(
ant