Did it actually get fixed now? That's good, although we're going to have some boosters but that fix wasn't very appropriate and it made the situation worse.
Anyways:

As you can see from this image, according to my friend a pk mob took place in that location. The kills were counting apparently. The first player #1 in the PK season leaderboard was there too. In addition to other pkers. I assume there was no admin available to stop the mob. However, decreasing the amount of possible kills players can get from towers is as bad as allowing mobs.
I wouldn't say this is the developers fault it's quite unfortunate that players tries to take an advantage and cheat in any possible way. I suggest the GP team to start banning/warning players that goes to mobs rather than just warp them (if they don't do that already). I hope something is also done towards the #1 current pker now for boosting his pks with other players in that mob.
I don't know if all kills are counted again, I don't know what suggestions can be acceptable and what suggestions can't be acceptable/possible. That's because i'm not a developer and I don't know as much as Dusty and the others know. So why not communicate with us? Why don't you allow us to help you guys? Yes, I know that there are people who tries to complain as much as they can for whatever reason. But you can just ignore this type of players and listen to the players who actually gives useful feedback as experienced players who plays this game. With the experience of being a developer and the experience of being a player we can get into a solution together.