This was because the sound went all the way to the end of the vinyl, causing the needle to loop it over and over again. The liner notes state that no pedals, outboard gear or synthesizers were used anywhere on the album.
The issue stemmed from the fact that the sound continued uninterrupted until the end of the vinyl, leading to the needle playing the same section over and over again. Additionally, the liner notes note that no pedals, outboard equipment, or synthesizers were employed throughout the recording process.