I operating JT65 mode that I think sometimes about PC clock control.
Yesterday also, I found the different time station. If the PC clock was delay or fast then JT65 flow was not synchronize of RX and TX.
Of cause that is no decode. This time control is most important item for JT65 operation.
However, it is afraid that the some person don't understand this matter.
Please check your PC clock. Is time correct? If your PC clock time is not true, please connect internet time server and synchronize your PC clock.
Don't forget, this is important of JT65 operation.