Yeah, can confirm this happens and only when synching wishlist. Before the steam festival the wish synching was working like a charm. Apparently it was just after the SteamFest/sales that it started to happen...
Also, worth mentioning that If I try to synch steam game/library collection there is no error, it says that it was successful ,so what's the deal? If its a steam problem, then it shouldnt be synching anything, not just wishlist... Hope they fix it because I got like 100+ games on my wish this couple days...