Although Kanji characters are originally Chinese characters, there are some differences between Chinese and Japanese fonts for certain characters, as an example check the character of ren 練 in renshuu 練習
There are many other Kanji characters which also have differences between Japanese and Chinese, some more noticeable than others, but all the font options in the new LingQ iPad reader seem to be using the same traditional Chinese font instead of a Japanese font, making some words odd looking and harder to recognize for a Japanese learner.
Although it may not be a big deal, it makes me a little hesitant of continue using the reader as it is now.