Does anyone know what is the reason some of my players /baltop is also missing?

They probably have the baltop exempt permission. Check using Luckperms verbose.

I have no idea how I can do it. Can you help me :'(

https://github.com/lucko/LuckPerms/wiki/Verbose

Closing this assuming that you figured out the issue. If it's not baltop exemption and you are still having issues let us know.