Contradiction with Exodus 28:6-8
Exodus 28:6-8 describes the construction of the ephod with different materials and colors, focusing on its artistic craftsmanship, which contradicts the specificity of the girdle being just for holding it together in Exodus 39:4.
Exodus 28:6-8: And they shall make the ephod [of] gold, [of] blue, and [of] purple, [of] scarlet, and fine twined linen, with cunning work.
Contradiction with Leviticus 8:7
Leviticus 8:7 mentions that the girdle is used to gird Aaron with the ephod already on him, suggesting a different practical function than what might be inferred in Exodus 39:4 (focusing on fastening the ephod specifically).
Leviticus 8:7: And he put upon him the coat, and girded him with the girdle, and clothed him with the robe, and put the ephod upon him, and he girded him with the curious girdle of the ephod, and bound [it] unto him therewith.
Contradiction with Exodus 39:5
Exodus 39:5 describes the girdle of the ephod as being of the same work, emphasizing its ornate work as part of the ephod, potentially conflicting with the interpretation of its functional purpose in Exodus 39:4.
Exodus 39:5: And the curious girdle of his ephod, that [was] upon it, [was] of the same, according to the work thereof; [of] gold, blue, and purple, and scarlet, and fine twined linen; as the LORD commanded Moses.