The phrase "are often contradictory" is correct and usable in written English.
It can be used to describe situations, statements, or ideas that frequently conflict with one another.
Example: "The findings of the two studies are often contradictory, leading to confusion in the scientific community."
Alternatives: "frequently at odds" or "often in conflict".
Provincial and national statistics on businesses and factories are often contradictory.
As is often the case with Ms. Banerjee, her public statements are often contradictory.
Every day the news tugs at us, implicating our reason and emotions in ways that are often contradictory.
The difficulty is that the wars in Israel/Palestine that people believe they are fighting overlap - and in the moral realm are often contradictory.
People's feelings are often contradictory as they seek to come to terms with the terrible things that happened to them or the terrible things that they did.
Today, scholars know of no authenticated personal property of Captain Kidd or his men, only accounts of his life and adventures, which are often contradictory or frustratingly vague.
Of course, there have been many studies, and the frustrating thing for climate communicators and campaigners is that they are often contradictory.
The reason few expect any sudden widespread revolt is that the concerns and complaints of the different constituents are not only distinct, they are often contradictory.
Hamptons regulations are often contradictory, run by competing state, village and town ordinances, leaving authorities at a loss to explain their purpose.
When individuals choose to break free from the conventions of the clan, "to better themselves", it can trigger reactions that are often contradictory, profound and nowadays not much discussed.
The path to saving can be particularly uncertain in the United States' fragmented health care economy — a mix of risk, regulation and profit in which the incentives are often contradictory.
