I recently reset the world seed for my Minehut server. Everything has been fine until I have managed to go to the nether. About 30-40 blocks away from my nether portal I had found multiple nether wood placed down and a different portal. I gave myself operator and then went into spectator mode where I found more building blocks already placed. Bridges with different types of wood were placed. I even went as far to try out the seed in a solo Minecraft world. No blocks were found already placed down here. Can someone help me figure this all out? Has this seed already been used before?
*EDIT* The seed is 6591279880162657090
*Note* This picture shows the already prebuilt blocks and nether portal.