Contradiction with Numbers 4:19
The Levites were to follow specific assignments and not all were to take on the role of priests, whereas 2 Chronicles 5:11 describes all the priests present as sanctified, suggesting a unified role in this instance.
Numbers 4:19: But thus do unto them, that they may live, and not die, when they approach unto the most holy things: Aaron and his sons shall go in, and appoint them every one to his service and to his burden:
Contradiction with Numbers 8:24-25
Levites were to serve from age 25 to 50, not specifically older, whereas 2 Chronicles 5:11 implies that all priests irrespective of age were sanctified, which may include those beyond 50.
Numbers 8:24-25: This [is it] that [belongeth] unto the Levites: from twenty and five years old and upward they shall go in to wait upon the service of the tabernacle of the congregation: [to...: Heb. to war the warfare of, etc]
Contradiction with 1 Chronicles 23:13
Only Aaron and his lineage were chosen to sanctify the most holy things, yet here in 2 Chronicles 5:11, it seems all priests are acting in a sanctified capacity, not just those of Aaronic descent.
1 Chronicles 23:13: The sons of Amram; Aaron and Moses: and Aaron was separated, that he should sanctify the most holy things, he and his sons for ever, to burn incense before the LORD, to minister unto him, and to bless in his name for ever.
Contradiction with 1 Kings 8:10-11
The presence of the cloud prevented the priests from standing to minister, whereas 2 Chronicles 5:11 mentions priests being sanctified without hindrance, potentially suggesting full readiness to minister.
1 Kings 8:10-11: And it came to pass, when the priests were come out of the holy [place], that the cloud filled the house of the LORD,