Quick answer
Anger does not stay a mood. The verse tracks it outward into conflict and then into a quantity of wrongdoing.
Read both lines
The progression is the argument. First יְגָרֶה מָדוֹן, stirs up strife, which is the same verb 26:21 used of the contentious man kindling a fire, so the anger is doing something to other people. Then the second line escalates from a man who has fury to a man who is בַּעַל חֵמָה, an owner of it, a possessor, and what he abounds in is not anger but transgression.
That is the verse's actual claim, and it is why the book keeps returning to this figure. Anger is not listed as a sin here; it is described as a multiplier, the condition under which a person commits many other things. The book gave the practical instruction at 22:24, make no friendship with an angry man, and 19:19 warned the rescuer.
Related: Proverbs 22:24–25 · Proverbs 19:19 · Proverbs 26:21 · Proverbs 15:18
New King James Version®, Copyright © 1982, Thomas Nelson. All rights reserved. Full copyright information. Scripture provided by API.Bible.
Go Deeper
If this verse has been used to put weight on you that it was never carrying, ask about it directly.