The previous crystal oscillator thread already suggested a pure measurement problem. I suppose that a 100 MHz oscilloscope with a standard 10:1 passive probe would show that the waveform isn't a sine, but you need 200 MHz or more bandwidth and a proper probe connection to asses the actual waveform.And how are you checking the waveform?
You need a wide bandwidth oscilloscope and low capacitance probe. Without these, the edges of a square wave will rise slowly and fall slowly making it look far more 'rounded' and similar to a sine wave.(...)
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