Sometimes they are increasing the price and getting ready for a "sale". I also saw the Magene Ultra Wheelset's price at $2000 but then it came back to $1200 or something.
probably, common practice all over Aliexpress. If you keep track, most items are always on some kind of discount, to give the impression that it's a special price and you either buy fast or the price will increase. Even though the higher price is on for like 10 days a year, and the usual price is at -30% tag.
So once in a while (normally right before some website sale) the price increases, for 1 or 2 days, and then comes right back.