וַיָּבִ֣יאוּ פָרִים־שִׁבְעָה֩ וְאֵילִ֨ים שִׁבְעָ֜ה וּכְבָשִׂ֣ים שִׁבְעָ֗ה וּצְפִירֵ֨י עִזִּ֤ים שִׁבְעָה֙ לְחַטָּ֔את עַל־הַמַּמְלָכָ֥ה וְעַל־הַמִּקְדָּ֖שׁ וְעַל־יְהוּדָ֑ה וַיֹּ֗אמֶר לִבְנֵ֤י אַהֲרֹן֙ הַכֹּ֣הֲנִ֔ים לְהַעֲל֖וֹת עַל־מִזְבַּ֥ח יְהוָֽה׃
And they brought seven bullocks, and seven rams, and seven lambs, and seven he-goats, for a sin-offering for the kingdom and for the sanctuary and for Judah. And he commanded the priests the sons of Aaron to offer them on the altar of the LORD.
Rashi on II Chronicles
and seven kids, etc. This was a temporary provision.
Rashi on II Chronicles
on the altar of the Lord but not on those altars that his father Ahaz had made.