Contradiction with Exodus 20:4
This verse prohibits the making of any graven image or likeness, while 1 Chronicles 28:18 describes the design and materials for the creation of a cherubim, which could be perceived as a likeness.
Exodus 20:4: Thou shalt not make unto thee any graven image, or any likeness [of any thing] that [is] in heaven above, or that [is] in the earth beneath, or that [is] in the water under the earth:
Contradiction with Deuteronomy 4:16-19
These verses warn against being corrupted by making an idol in the form of any figure, including animals or celestial bodies, contrasting with the specific instruction to create cherubim in 1 Chronicles 28:18.
Deuteronomy 4:16-19: Lest ye corrupt [yourselves], and make you a graven image, the similitude of any figure, the likeness of male or female,
Contradiction with Isaiah 42:8
God declares not to give His glory to another, nor His praise to graven images, yet 1 Chronicles 28:18 describes the use of gold for cherubim, which were to be placed in a sacred space, seemingly giving glory to created images.
Isaiah 42:8: I [am] the LORD: that [is] my name: and my glory will I not give to another, neither my praise to graven images.