hey, got a riva 1100 yesterday and everytime I use it it makes a sound, I cant describe it, sometimes its gurgly but sometimes its just like a gurgling sound but not wet sounding, like its the sound of the liquid evaporating. I was just wondering if its normal for it to make a sound atall or if I'm doing something wrong when filling it, as my e-lite before made no such sound. I'm using atomisers with cartridges. Also a second questions- one of the atomisers supplied has a much lower resistance when you inhale than the other. Theres no mention of a difference between them anywhere and as I've never used atomisers before I dont know which is the more normal. Is is likely theyre just of different resistances or could it be that one is faulty? I've been pondering these questions for a while and tried different things to get rid of the sound like blowing through the atomisers, then I thought I'll consult the wisdom of the forum. thanks in advance!