Contradiction with Matthew 6:3
Encourages giving in secret, while 2 Chronicles 31:5 describes a public offering.
Matthew 6:3: But when thou doest alms, let not thy left hand know what thy right hand doeth:
Contradiction with 2 Corinthians 9:7
Advises cheerful giving from the heart, whereas 2 Chronicles 31:5 implies a commanded or obligatory offering.
2 Corinthians 9:7: Every man according as he purposeth in his heart, [so let him give]; not grudgingly, or of necessity: for God loveth a cheerful giver.