Well... Does it really work for you ?
Here, when I look at your latest content, your most recent one is
SOLVED Bastille template for Caddy
Dated back 20th of July...
I guess I wasn't clear on the issue. However, I noticed that "Your Content" is a search result, so it seems likely that there is something *wrong* in whatever the forum is using for that search request. The more current 'Latest Activity' is up-to-date, so perhaps this is what that "Your Content" should actually link to, as it is more what one might expect it to be (although a relatively exhaustive list is assumed). I can look and see if there is anything involved which I can adjust that is not 'hardcoded' in any way.
UPDATE:
I looked around and cannot see anything accessible which I can adjust, although the search term given is simply the userid number, so how ever things are cached seems to be the real issue or how the search itself functions. I tried a similar search outside in the main search dropdown with the exact same results. If I could just force this item to be hidden from view (via style adjustments) it may be the best and most workable solution that doesn't involve structural template adjustment. The better solution would be to find the appropriate template, substitute 'latest activity' for it as the other seems functionally broken. I don't like to modify structural templates since on occasion things on the entire site get changed which then later means things break (or could break).