No, you are not seeing duplicates, this is really a copy of one of my works, but I recreated it in version 1.7.10.
Despite the difficulty in obtaining the best possible result, this was what I was able to adapt to an old version, since the previous one was in version 1.15+
Note: Work created in version 1.7.10
Rescue 3 blocks from the floor. south facing player
"This is a replica of my work, already posted here."