I assume you are looking at forum/image.php. That appears to have something to do with your Human Verify (captcha) system. You might change to a different Human Verify option. My guess (and it's only a guess) is that some hacker system is trying to get every image in the Image option for analysis.
--------------- Added [DATE]1327887135[/DATE] at [TIME]1327887135[/TIME] ---------------
In cPanel go to Awstats and look at Hosts (top 25) and see where all the requests are coming from. If one is using a huge amount of bandwidth check it out. I doubt it's a member. If you can't find that IP for anyone, ban it.
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