Do you mean duplicate posts? You're on the everything all, which shows the same posts but from each account you're signed in too.
I don't think so, but would be highly appreciated. Otherwise "Everything" is pretty useless.
Here is an alternative Piped link(s): https://piped.video/VIRD_EHhO_I
Piped is a privacy-respecting open-source alternative frontend to YouTube.
I'm open-source, check me out at GitHub.