Help with irfp240

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Hi I ahve a situation where I use Vishay IRFP240 nad with VDS=24V and VGS 3.8V i GET 1,4 AMPERES. The datashheet shows tha I need 4.8v for 1.4 amperes. In a same circuit that I use IR mosfets I need 4.87 VGS for 1. 3 ampere. Is this is normal? Are the mosfets fake Is anything else wrong?
 
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