"contradict on" is not a correct or usable phrase in written English.
To express the idea of contradicting something, you could use phrases such as "contradict," "refute," "dispute," or "disagree with." For example: "He contradicted my arguments and refused to believe my point of view."
The original sources were also said to contradict on a number of events.
These sources contradict on a number of events in Nero's life including the death of Claudius, the death of Agrippina, and the Roman fire of 64, but they are consistent in their condemnation of Nero.
Although my experience with PRO measures would support many of the recommendations in the guidelines there are others that I would not fully agree with or would contradict on the basis of my own research evidence.
The canonical gospels contradict one another on that front.
Rove was publicly embarrassed on NBC during the 2000 election when he claimed Florida for Bush and was contradicted on-air by Tim Russert.
Medical staff members contradicted one another on basic matters like when and where he died.
Of course, the optimization goals for the optimal clustering are somewhat contradicting: on the one hand, a small number of clusters is wanted.
England managers are often caught between the devil and the deep blue sea, with calls for the ditching of the old guard on one side being contradicted on the other by suggestions you win nothing with kids.
The apparent dryness of this theme is contradicted on every page.
The slow-growth picture, Mr. Sherlund acknowledged, may be contradicted on April 18, when Intel reports its quarterly results.
Several said they had poured beer over Mr. Diaz's head and dragged him, unconscious, into the bushes; all details that Mr. Diaz contradicted on the stand.
