Is it possible your wire came with oil on it? you could unwind a foot and run your fingers down it a few times to see if you get a dirty oil color on your fingers, test both the wires, in either case wether it be dirty wire or not i'd pull the wicks out and wash the coil's in hot soapy water using a toothbrush, hopefully you'll be able to do this with them still installed in your atty to save on time, then i would give them a nice dry burn before installing your wicks to get them dry and to check for any shorts.
Apart from this i would also check that your
coils aren't touching anything they shouldn't when your atty is all together.
Have you built on this atty before or is it a new one with its first build?