2 Kings 14:4

Howbeit the high places were not taken away: as yet the people did sacrifice and burnt incense on the high places.

The king did what was right in the sight of the Lord, yet the high places were not taken away. The people still sacrificed and burned incense on those high places, so the turning back toward the Lord left their established worship there unended. It was an incomplete reform, in which right doing before the Lord coexisted with the old places of worship left standing. In the same way Sunday observance persisted alongside reform, continuing as the high places did in Israel's worship.