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Heres what it says
At 6th level, the sacred fist gains a style feat as a bonus feat. The sacred fist must meet the style feat’s prerequisites. He uses his warpriest levels as monk levels for the purposes of meeting the feat’s prerequisites. At 12th and 18th levels, a sacred fist gains either another style feat or a feat that requires a style feat as a prerequisite.
Note that it makes no mention of being able to do so with the first one, so does that mean the first feat can only be used to take a style feat? or was this an oversight from the writer?
If the feat at 6th level was intended to have the same limits as the other two it would have just said "at 6th, 12th and 18th level..." or such. Since the two sections are written distinctly I's say they are intentionally different.