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A shift of 500Hz (that’s HERTZ not KILOHERTZ!) is completely normal. It allows the program to generate the tones at a higher frequency to keep harmonics outside the TX passband.
73, Paul G4IJE.
From: main@WSJTX.groups.io <main@WSJTX.groups.io> On Behalf Of John
Sent: 12 May 2021 21:35
Subject: [WSJTX] Frequency shifts down 500KHz on transmit #FT8
Everything was working great, WSJTX, JTAlert and HRD LogBook.