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Closing KC Volatility

I am not sure why my broker shows an increase in implied volatility. My calculations are that they are lower. However, the volatility shown is accurate if not the change.

KC EOD Straddles: (H 12850)
{{F 127.5 strd 370/400,}} 23.85% +0.8%
{{G 127.5 strd 775/815,}} 22.9% -1.2%
{{H 127.5 strd 1020/1060,}} 23.35% -1.5%
{{K 130 strd 1430/1480,}} 23.4% -1.1%
{{N 132.5 strd 1755/1815,}} 23.65% -0.8%
{{U 135 strd 2100/2180,}} 24.15% -0.4%
{{Z 137.5 strd 2460/2560,}} 23.8% -0.2%
{{H9 142.5 strd 2815/2935,}} 23.7% -0.2%