Many of the contradictions above stem from a literal interpretation of the stories in the Bible. Some verses may be mistranslations, allegories, exaggerations, etc and can be interpreted in the context of the society in which they were written, rewritten, or otherwise modified over time. Considering that 46% of Americans believe in a literal interpretation of Genesis (and probably other portions of the Bible) and the fact that many sects disagree on which parts to take literally, it seems reasonable to include these contradictions based on literal interpretation.
The creators of the site seem to think that just because people cannot agree on what to take literally and what not to take literally is itself a contradiction against the Bible. Mistaken interpretation does not mean a contradiction if a passage was not meant to be taken literally. The KJV is 500 years old and not based on the best manuscripts and evidence that we now have access too, so to include such mistranslations" and misunderstanding due to ignorance of culture, language, and the audience to which the texts are written is extremely dishonest.
BibViz Project - Bible Contradictions, Misogyny, Violence, Inaccuracies