It would seem that Proverbs is not the entirely the work of Solomon. This is a minor point but it is an important reminder to us. Most people who believe think that Solomon was the author of Proverbs. For most of it, he was. But there are parts that he did not write. As the old Roy Rogers and Dale Evans song says, “How do I know? The Bible tells me so.” You will notice the same problem if you look at chapter 31.
If you did not know it before, know it now: Part of Proverbs was not written by Solomon. Why is this important? Much of what “the Bible says” it actually doesn’t say. Don’t take anyone’s word for it (including mine). Read it for yourself. Listen to sermons with your Bible and mind open. People died to bring you this book in understandable English. Make sure they did not die in vain. A recent book on this worth a read is:
Farris, Michael. From Tyndale to Madison. Nashville: B. & H. Publishers Group, 2007.