Overheating Concerns?

I have an 1996 Honda CBR600F3. After riding for a while and sitting Idled in traffic the temperature gauge rises to slowly to the mid hot point. However after I began riding again and shifting through the gears at high speeds. The temperature gauge begins to slowly lower back down to cool. But while sitting idled the bike seems to start overheating and the fans kicks on every time. Any suggestions as to why it seems to start overheating while sitting Idled. Thanks in advance.

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