Recently a player on the server (Pebbles) was banned multiple times for kill aura, except he wasn't using kill aura. Not only was he banned and unbanned multiple times, it was the same video that got him banned the first time. Edit: Also forgot to mention that he was re-banned for the video after XChaosZeroX said that the video couldn't be used against him.
I'll be using the video as points of reference in this post so I'll link it here for those of you that haven't seen it yet.
https://youtu.be/bBKCq2s31BA
I'm not gonna say that in any part of the video it doesn't look like he's hacking, there are some sketchy parts but I am going to give points on why these parts can be legit.
The first instance in which Pebbles looks to be hacking is around 0:09 - 0:13, he lands a hit when he's looking to the left of Caleb. The way this is possible is either of the two lagging or Caleb's client rendering Pebbles in the wrong spot (sorta like when you see people running through the ground), where in reality Pebbles is probably inside Caleb at the first hit and then looking at Caleb and Caleb's client rendering him as looking somewhere else. This also could be meep's hit detection acting weird regardless it's just one or two weird hits which shouldn't be considered enough evidence for a ban.
The second instance is around 0:16 - 0:18, it seems like Caleb may have been lagging and took delayed knockback or Pebbles got some decent ping hits.
The third instance and probably the main reason he's been banned and re-banned over and over again happens around 0:50-0:59, Pebbles hits Caleb into the air and then straight lines him back, the reason Pebbles looks like he's using reach is because 1. Caleb is in the air which means pebbles has the slight lower ground advantage 2. Caleb is taking knockback allowing pebbles to sprint forward and land more hits. When you take knockback your reach is slightly reduced because you're moving backwards. It's why straight lining works. If Pebbles had reach Caleb wouldn't be able to land those hits in mid combo around 0:55. Meep's crappy hit detection also probably had some involvement in this as well.