Contradiction with Exodus 27:1
Exodus 40:26 mentions the "golden altar" in the tabernacle, whereas Exodus 27:1 specifies the "bronze altar" for burnt offerings, which is usually placed at the entrance of the tabernacle, not inside.
Exodus 27:1: And thou shalt make an altar [of] shittim wood, five cubits long, and five cubits broad; the altar shall be foursquare: and the height thereof [shall be] three cubits.
Contradiction with Exodus 30:1
Exodus 40:26 describes placing the golden altar, while Exodus 30:1 gives specific instructions for making it, underscoring different contexts of its placement.
Exodus 30:1: And thou shalt make an altar to burn incense upon: [of] shittim wood shalt thou make it.
Contradiction with Hebrews 9:2-4
In Exodus 40:26, the altar of incense is set before the veil of the ark, but Hebrews 9:2-4 suggests it being part of the Holy of Holies, indicating a different configuration.
Hebrews 9:2-4: For there was a tabernacle made; the first, wherein [was] the candlestick, and the table, and the shewbread; which is called the sanctuary. [the sanctuary: or, holy]
Contradiction with Numbers 4:11
According to Exodus 40:26, the golden altar is set up permanently, while Numbers 4:11 discusses covering the altar for transport, revealing different uses or settings.
Numbers 4:11: And upon the golden altar they shall spread a cloth of blue, and cover it with a covering of badgers' skins, and shall put to the staves thereof: