This is pretty annoying. It happens only sometimes. But only today it happened to me at least 4 times.
When you have the server editor open for a remote server and then after a while click e.g. on the Remote Server Home field to change it - BANG! - the server name is suddenly injected in this field instead of the path that was there just a second ago.
I got this on a Mac. But earlier today rawagner so the same when he was trying to reproduce JBIDE-12961 for me on Ubuntu.