This is a known issue.
The problem is that SolarWinds is session-based. Every tab or window of your browser all goes back to the same session pool. So the Node Edit page pulls the data for node 1. If you then open an edit page for node 2, you over write the session info for node 1 (even though it stays on the screen in that window).
NOW... when you hte save for node 1, it's writing the SESSION DATA... not what you see on the screen. So you end up having node 1 "loaded" with node 2's info.
There is - as far as I know - no fix for this. It's the way SW is designed.
The "solution" is to "don't go like that", and to use multiple browsers if you are going to edit multiple nodes. Not multiple windows, mind you. Multiple browsers - Firefox, Chrome, Opera, Safar, etc.
No, no. Not the blue "E". Never ever every use the blue "E". Unless you need to download an actual browser.