Poles of the Ark

Rabbi Yosei, son of Rabbi Ḥanina, raised a contradiction. In one verse it is written: “The staves shall be in the rings of the Ark; they shall not be removed from it” (Exodus 25:15), implying the staves should remain there permanently. But in another verse it is written: “And its staves shall be put into the rings” (Exodus 27:7), implying that when the Ark is used the staves are inserted, which suggests that they do not remain there permanently. How is this contradiction resolved? The staves could be removed from their position, i.e., they were loosened, but did not come out. The staves were wider at their ends and thinner in the middle. Therefore, once they had been forced into the rings, although they could be shifted, they would not be removed entirely.