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SN74HCT244: VIH problem

Part Number: SN74HCT244

Hello Team

My customer is using SN74HCT244. Power supply is 5V. When the input voltage is voltage is 1.1V, the output is 2.6V. when the input is 1.4V, the output is 5V. But   the VIH is 2V. So why the out have output when the input the meet the VIH? So could you help explain it? Thanks.