Regarding Asaph (אָ֫סָ֥ף), why do certain online KJV texts remove his name from Psalms 73-83, such as Bible Gateway's?
If we only read the KJV, the Tehillim (Psalms) may appear to be written by King David. However if we read the Tanakh, we find authorship of Tehillim (Psalms) 73-83 is ascribed to Asaph of 1 Chronicles 16:37. We find in Asaph's name in the Hebrew Psalms but not in the English Psalms of KJV Bible.
Tehillim 73:1 [MT]: A song of Asaph. Truly God is good to Israel, to the pure of heart. (מִזְמ֗וֹר לְאָ֫סָ֥ף אַ֚ךְ ט֖וֹב לְיִשְׂרָאֵ֥ל אֱלֹהִ֗ים לְבָרֵ֥י לֵבָֽב )
Psalm 73:1 [KJV]: Truly God is good to Israel, even to such as are of a clean heart. (Bible Gateway)
Is this a textual choice they made for some editions of the KJV, or are there manuscripts that do not include the titles?