My thoughts exactly, and there’s really not much going on after the optocouplers.
1. My thoughts as well, but it looks like my flashes (Godox tt685) triggers on a flank or something, the pulse can be ridiculous short, but it would still doubletap. (Yes, past tense :-D)
2. 4 Godox TT685, I tested each individually, and trust me at low output, these suckers can cause epilectic seizures. it might be 5 ms, judged by the drop having moved 5-6 cm between each flash, and yup everything worked just nicely after switching back to the V2.
I managed to kind of fix the problem, although I still don’t know what was wrong, I was planning to make a breakout board for the optocouplers, as I wanted to double the camera connector, so I did just that, wired it quickly into the V3 and problems just went away. I’m still not sure what could have caused it, but happy times are here again 😉
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Thanks again for a great design!