Well, let's try to troubleshoot together...was is still so new that the hemp isn't broken in all the way yet? Do you have a good fit? Did it leak out thru the middle of the diaper or wick around bindings or what? How long was baby in it? Obviously, if it is super new, more washings to break in the hemp are a necessary thing. If there wasn't a good fit, then sure, it could have leaked through most anywhere. Some dipes with pul need one time in the dryer to help seal the pul. It could possibly need extra absorbent layering if you have a super heavy wetter. You can always ask Terri (fmbg wahm) what she suggests b/c she is awesome to deal with and I'm sure would love to help you out!
I know for us, I'll often not do enough prewashes before initial wearing, but then I need to remember to not expect the diaper to be maximally absorbent. Remember, hemp needs like literally 8 washes to become max absorbent. You can also boil it to speed up the process, and also dryer dryings help in that respect too. HTH!