That's terrible, but it s mostly your connection in this vid...the fact only you and specifically the people you're fighting aren't taking damage is your fault, trust me I'd know. If it was one person on the enemy team teleporting everywhere and never taking damage than that's ridiculous (and happens a lot) But in this case you weren't doing damage and they couldn't see you, so it's your connection.
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It not though if that was the case I would be experiencing the same issues in other games with P2P connections and I don't.