Claude, at present this is not unwanted switching to EU VHF mode, but the naming or wording of what is happening is misleading.
The situation seems to be that you work a station that is in a contest requiring an exchange of a serial number and/or the full locator (a 6-digit locator). In order to receive this from you he currently has to enable the EU VHF mode which confuses you. This has nothing to do with EU VHF, it is just an exchange of an 'oldfasioned' report, a serial number and the full locator. A serial number is needed in many other contests or QSO-parties than at VHF in EU. The function of WSJT-X and the nomenclature in the menu should be that each station requests the kind of exchange he needs from his QSO partner for whatever QSO-party or contest he is in. Then you send him what he wants and you receive the exchange you want. This may not be the same kind of exchange and you do not need to be in the same QSO-party or contest, but both of you receive and log the exchange you need. Then no confusing windows about a VHF or special contest mode is needed. There seems to be an error when logging the 6-digit locator in the <STATE> field. This is probably caused by the assumption that both stations send and receive the same type of exchange. The logging could be fixed so each station logs the exchange received for his own contest. 73, Palle, OZ1RH.
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