Using slot0_.sqrtPriceX96 is wrong, why？

[mikehahahaha]

amount0 = Math.calcAmount0Delta( slot0_.sqrtPriceX96, TickMath.getSqrtRatioAtTick(upperTick), amount ); amount0 = Math.calcAmount0Delta( TickMath.getSqrtRatioAtTick(slot0_.tick), TickMath.getSqrtRatioAtTick(upperTick), amount ); why？ slot0_.sqrtPriceX96 TickMath.getSqrtRatioAtTick(slot0_.tick)