The high places where not taken away; not fully nor universally; of which See Poole on "2 Chronicles 17:6". The fault was not in Jehoshaphat, but in the people, who, though they did worship the true God, yet would not be confined to the temple, but for their own conveniency, or from their affection to their ancient custom, chose to worship him in the high places; which Jehoshaphat was forced to connive at, lest those people, being debarred from that dearly-beloved practice, should fall into a neglect of God and his worship.
Related Commentaries of 2 Chronicles 20:33
2 Chronicles 20:33
33 Howbeit the high places were not taken away: for as yet the people had not prepared their hearts unto the God of their fathers.