I've uploaded a couple of images yesterday, all of them by clicking "Upload an image for this map" from the server details, however some of the names showed wrong making duplicate entries:

Unreal Tournament CTF-ancient 09/15/10 Preview <-- must be CTF-UnholyShrineIV
Unreal Tournament CTF-ancient 09/15/10 Preview
Unreal Tournament CTF-SquirrelBalls 09/15/10 Preview
Unreal Tournament CTF-Xmasvillages 09/15/10 Preview <-- must be CTF-FastAndFuriousStealthDP
Unreal Tournament CTF-Xmasvillages 09/15/10 Preview
Unreal Tournament CTF-Bot_40BME 09/15/10 Preview
Unreal Tournament CTF-2on2-Crates 09/15/10 Preview

I'm pretty sure the name in the dropbox showed the right name when I uploaded the image but will check for this better the next time. Sorry for the inconvenience.

If a map got uploaded with the wrong name, you can still upload the correct image.

If you see the incorrect map image on the server page, click on the link that says "Incorrect image? Upload new!"