Why do Nikon SB flashes set to TTL automatically turn to TTL FP?

edited October 2016 in V6 II Problems
When using Cactus V6 II, I have noted that all my Nikon SB flashes, set to TTL before turning the Cactus V6 II receiver on, turn to TTL FP as soon as I take the first photo, and the ISO get changed to 50.

Is this a normal procedure? If it is not, how to avoid it?

Thanks for your advise.

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