That was the only problem I've ever experienced with the Triton tanks. Just last night, in fact, on two different tanks. After a cleaning (and new coils), they screwed on a little rougher than normal, but I ignored it.
They both ended up leaking slightly when left horizontally (they never had before). The problem was easily fixed, but I have to be extra careful screwing those tips in now or they don't catch properly. I think the problem arose because I tend to lean the refill dropper on the center air shaft while filling. I should probably get one of those fancy needle tipped bottles, and this problem can be avoided.
