Hello, we are having some issues that whenever someone prestiges or even reaches our last rank before they prestige, it takes all their perms and their chat format and everything. Here is the config here. Our whole luckperms file is 1 GB and would be way too much to even upload to Mega, I am not sending you 838 ranks each file individually so all I can send is the config.

https://hastebin.com/ofiqodozos

How are the players ranked up?

99% an issue with your rankup plugin doing weird stuff on the last stage(removing the users group and don't adding the last one or your last group is broken without having the previous ones). Either provide info on how the plugin is doing that or even better, ask the plugin dev of your rankup plugin for help

They rankup by doing /mru or /rankup and it takes away their last ranks and adds the next rank to them.

@RisenCloud check if they get the new group.

They do, it's the same config we have had for almost 4 years. Same groups, same perms, everything. Just now it starts to glitch.

Sounds like an issue with your rankup plugin, not LP.