Hello,
When i add a temporary group with a less weight that currently player group, the tchat display the weightest group but not the tab. I use Stablist and essentials chat.
Issue is only for temporary group.
There is an option for that or it's Stablist ?

If the correct value is showing in the output to the LuckPerms user info command, then it’s most likely an issue with the plugin using the data (the tab plugin) or the way you have it configured.