Thank you very much for your explanations, but I forgot to say that I had this problem during QSO in the fox and hound mode. Usually Dxpeditions stations operate on non-standard frequencies. For example, If a DX station operates on a frequency of 14.095 000. I set this frequency in the transceiver, this frequency appears in the WSJT-X window and glows red. But when I call this station, both in the transceiver and WSJT-X my call occurs 500 Hz lower, that is, on the frequency 14.085 500. When I working on standard frequencies, I have no eny problems.