I have no fish, why won't my ammonia level go down?

My tank finished cycling a week ago, or so I thought. I just bought a new test kit yesterday, the API Freshwater Master Test Kit. I tested the water about 24 hours ago and ammonia levels were at 2.0. I tested the water again just now and it's still at 2.0. I have 6 freshwater plants, could they be affecting the ammonia level somehow? I haven't added any ammonia in a few days so I can't figure out why the ammonia level won't go down. When I used my old test strips the ammonia seemed under control... it would go down to 0 overnight. I was told this test kit was much better and more accurate... but I'm sure there has to be something wrong.

btw, the nearest aquarium supply store is an hour away so I don't really have the option to take my water in to be tested for me. Nor do I have the option to simply return the test kit. Next weekend when I go to buy my fish I'll take a bit of water with me to be tested though. Until then, I'd still like to know why my ammonia levels are staying at 2.0.
 
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