This is one of those later copies that I mentioned. Mirror target is here for this script on OUJS. Notice the bigger scriptid number in the link... which means it absolutely came later than sebaro's mirror target here. Since both are GPL embedded it is considered a fork here on this script. USO didn't have forking capabilities hence why you are seeing double.
So, which one is the copy,
This or https://openuserjs.org/scripts/sebaro/ViewTube ?