おはよう、 ブラッドさん。 ようこそにJPod101.
Morning, Brad. Welcome to JPod101.
If you haven't done so already, check out this link:
http://www.japanesepod101.com/write-japanese/It talks about the three different writing systems that are used in the Japanese language, excluding romaji, which are ひらがな(hiragana)、カタカナ(katakana)、and 漢字(kanji). Just about every lesson contains pdf lesson notes and additional vocabulary, review, and study links. As for the discrepancies you mentioned, maybe you can let the staff know which lesson it is so they can decided whether it needs revision or not. It could be that your answer lies within those additional learning tools.
Hope this answered your question, and if not, feel free to ask once more. The staff and other members around here seem nice and helpful.
がんばって!
Good luck/do your best!