Blocks appearing in middle point of four blocks in the air

I recently started a new world, playing under creative. I am using the Biomes O’Plenty mod as my seed. I started extending a village that’s on an island off the coats, the island biome is Plains/beach, and as I was building these blocks started to appear from 3-7 blocks off the ground and in between where a quad of blocks intersects. I cannot destroy them and I fear the issue is getting worse. I cannot find anybody that’s reported anything like this so I have no idea what to do.