My jpg files are being overwritten by files in another folder

Hi,

The attaced screen shot shows part of my Bridge. The main image is a shot I took and saved in its own folder yesterday (which has not been edited and is still a RAW file) and the visible thumbnail is an edited jpg I took on the 28th October.
Can anyone explain why these files have got mixed up?
And more importantly can anyone help me to recover my jpgs?
Thanks for your consideration
Phil