They'll want you to put in more information about it. But I highly doubt it's a bug.
See the thing is there's always a chance to break synth. I've failed on lvl 5 synths with level 50 skill. I've also done 10-20 desynths and not lost an item, and then done 10 desynths and not completed a single one. It's like a roll of the die. If you roll a die 5 times, the chances of them all being 6s is much higher than if you roll a die 200 times. So even though you're seeing a weird pattern, the pattern you're seeing is based on the fact that your looking at your numbers.
But also I noticed you didn't mention which synth you were attempting, which moon phase it was on, which direction you were facing, or the day of the week. So if you were doing a lighnting synth, possibly on Earthsday, when you had the moon phase which decreases success rate, but increases HQ rate, etcetera.
There's really no information in your post on how many times you attempted, what it was, or anything. The information is so generic, and incomplete there's nothing that they could even go off of.
Sounds more to me like you just had a stroke of bad luck, and aren't paying attention to the moon, days, and direction.
Personally I dont' know if facing Soutwest really helps my Alchemy desynths, but losing out on those desynths is just too painful for me to deal with time and time again to leave out such a quibbling detail if I can remember it. But I know moons are important as well.