It looks like your camera automatically chose to focus on the background. There are a few reasons why. Most likely, you were too close for the camera to focus on the fern, so it chose to focus on something that it could focus on. (Every lens has a "closest" distance at which it can focus.) Alternately, you may just have tricked your camera -- autofocus systems aren't perfect, and sometimes they guess wrong about what you want to focus on.
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