When doing an edit, if you CANCEL the change and then click EDIT again, your previous (uncommitted) changes are shown on the left editor panel.
That’s because the session is still cached - to prevent people from loosing their work if they accidentally press Cancel instead of Submit. It is by design, on other words. Perhaps clearing your browser (Cookie) cache will reset to your uncommitted changes. If not, pressing Undo (typically Ctrl-Z or Command-Z) enough times will undo your changes.
Yours,
Christian
In most (all?) web-browsers, Ctrl-F5 will reload the page from source (without using the cache), which is probably the easiest way to reset the page.
Personally, I use Firefox with the “Reload Skip Cache Button” extension, which adds a button to the toolbar to do this with the mouse (for when I don’t have the keyboard handy).