Anyone can make a list claiming something is contradictory. Although from the header of that site you can clearly see that it's an issue of the heart primarily, which motivates unreasonable scrutiny like this.
The first "contradiction" I clicked on was claiming the Bible saying that Aaron dying at Mount Hor and saying he died at Mosera, which was the camp at Mount Hor, is apparently a contradiction. That's like saying a description of someone who died in the USA under the presidency of Benjamin Harrison and another description saying that the same person died during the Victorian era is contradictory.
Also worth acknowledging the admission in the footer "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, while others are very clear contradictions."
That's simply just a different counting system being used across different cultures. Some systems would count the first year of reign as being year 0, others year 1. South Korea recently used a different system to the rest of the world. So under this system if someone wrote that a child was two years old and the another wrote that they were three, but the second was a South Korean, both would still be correct.