A bit late, nonetheless, some clarification can't hurt. First off, several important bits can be found
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.
Pay particular heed to: Basic Bio Rules? and How To Make A Bio?
All in all, there are a plethora of reasons as to why a bio, aside from the above bits, can be declined:
All bios must not infringe on Naruto continuity, however, they must also be plausible within the Naruto-verse.
Essentially, refrain from the following: weird anatomy (tails, hooves, etc); weird origins (different dimensions).
No normal bio can have abilities/attributes like super-strength, super-speed, extremely prolonged lives. CC can vary.
Also, Lili-chwan has reminded me of a very important thing. Many bios were approved, but dropped by the people whom made them. When bios are dropped, by default, they go to the declined section, unless the user wants to reuse one.
For future questions related to the RP, I implore you to post them in the following thread:
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Many competent and skilled RPers can guide you when it comes to basic RP questions.