Asa may have removed the high places associated with the worship of false gods but not those where people worshipped Jehovah.
رُبَّمَا نَزَعَ آسَا ٱلْمُرْتَفَعَاتِ ٱلْمُخَصَّصَةَ لِعِبَادَةِ ٱلْآلِهَةِ ٱلْبَاطِلَةِ ،‏ لَا ٱلْمُرْتَفَعَاتِ ٱلَّتِي عَبَدَ فِيهَا ٱلشَّعْبُ يَهْوَه .‏