When navigating through pictures to correct the rotation, I usually use left/right arrows plus "r". From time to time, I find that Lightroom has put me into keyword editing (it has changed from Develop to Library) and that my r's are being appended to the last keyword. Also, it sometimes decides to go from grid view to loupe - or vice versa - just whilst using the mouse to select photos in the film strip.
Do others also have this issue or am I just unknowingly pressing some other key or clicking on something else too?