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You are overdriving the crystal. The only thing keeping it from fracturing is the 100 pF loading the output buffer.
Put about 220k ohms in series with output buffer to crystal and two 18 pF on either side of crystal.
I had this cuicuit that generate 1 hz using crystal oscillator.. it is working fine with 9v supply but when i connect 5v it becomes more faster ,, why is that happening ?