As someone who has some amateur experience in electronics, I can say from looking at the wiring diagram there are many potential problems here. Add to this that you or your tripod acting as an earth return may present lower resistance than the earth returns in the electronics and you've got a potential nightmare. I'm not surprised someone might get a jolt once in a while. Operating this set up while standing in wet grass or on a concrete slab in bare feet could be a really bad idea.
I am not qualified or experienced enough to give advice regarding the approach to resolving this and ensuring its safe. I hope the thread attracts the attention of someone that feels comfortable doing this.
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