The book of Proverbs in the Bible was mostly written by Solomon, who scripture tells us had the wisest and most discerning mind of any man to ever live, by the gifting of God Himself. (1Kings 3: 12).
Consequently, it would be safe to say that there is nothing contradictory to be found in the Proverbs (or the balance of scripture for that matter, considering its authorship.)
But the term “proverbs” has been appropriated to refer to lots of so-called wisdom writings and sayings that have nothing (or at best little) to do with the Truth of God’s word. And some of those “proverbs” do contradict themselves.
Here is list that identifies 15 Contradictory Proverbs. Interesting, huh?