Problem with normal synchronization.

Hi, my photographic equipment is composed by Fuiji XT2 and X-Pro2, two cactus V6 MKII and 2 flashes Pixel x800C Pro Canon.
I have updated the cameras and the Cactus to the last update.
It works correctly in HSS in both cameras, the flashes are in ETTL position.
My problem is when I want to shoot at low speeds, that is 250 down, I switch off the HSS option and do not synchronize any of the two cameras with the Cactus.
Can you tell me about what I do wrong?
Sorry for my English, I use translators.
Thank you.


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