I see you posted this article to 4 communities. According to the comments on this post if you use the cross post function (in the default web frontend), it will only show once in the feeds instead of 4 times (which can be a bit annoying).
If you use an app or a different frontend, I don't know if it'll work.
It's also possible that you have crossposted them and lemmy is not grouping them properly, in that case, please ignore this comment.
Thanks