Radiator question? 2002 buick rendezvous?

So I have a 2002 buick rendezvous that is constantly over the halfway mark on the temp gauge, it used to hover around a quarter. I had the thermostat replaced, the radiator flushed, and the fans checked. There's no leaks in the radiator either, car seems to run fine but this kind of concerns me. Anyone have any ideas?
 
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