I have a BungeeCord and a spigot server, LuckPerms is connected to MongoDB, the messagin is üb he redis. If I change the rank of a player in the BungeeCord, the event will not be executed on the spigot server, but only on the BungeeCord. The same is also the other way around. v5.1.16

Yes, that match! The player has the same groups in lpb and lp. And the same uuid!

Can you show screenshots of that - and show what the issue is?

Make sure you have IP Forwarding setup correctly.

https://github.com/lucko/LuckPerms/wiki/Network-Installation

i have setup all for my bungeecord

Are they both connected to a MySQL database?

What does /lp info and /lpb info show?

20:42:51 [INFO] [LP] Running LuckPerms v5.1.16 by Luck.
20:42:51 [INFO] [LP] - Platform: BungeeCord
20:42:51 [INFO] [LP] - Server Brand: Aegis
20:42:51 [INFO] [LP] - Server Version:
20:42:51 [INFO] [LP] Aegis fork
20:42:51 [INFO] [LP] - Storage:
20:42:51 [INFO] [LP] Type: MongoDB
20:42:51 [INFO] [LP] Ping: 7ms
20:42:51 [INFO] [LP] Connected: true
20:42:51 [INFO] [LP] - Messaging: Redis
20:42:51 [INFO] [LP] - Instance:
20:42:51 [INFO] [LP] Static contexts: server=proxy
20:42:51 [INFO] [LP] Online Players: 0 (0 unique)
20:42:51 [INFO] [LP] Uptime: 1h 7m 21s
20:42:51 [INFO] [LP] Local Data: 0 users, 16 groups, 1 tracks
and
[20:43:12 INFO]: [LP] Running LuckPerms v5.1.16 by Luck.
[20:43:12 INFO]: [LP] - Platform: Bukkit
[20:43:12 INFO]: [LP] - Server Brand: Paper
[20:43:12 INFO]: [LP] - Server Version:
[20:43:12 INFO]: [LP] git-Paper-284 (MC: 1.15.2) - 1.15.2-R0.1-SNAPSHOT
[20:43:12 INFO]: [LP] - Storage:
[20:43:12 INFO]: [LP] Type: MongoDB
[20:43:12 INFO]: [LP] Ping: 12ms
[20:43:12 INFO]: [LP] Connected: true
[20:43:12 INFO]: [LP] - Messaging: Redis
[20:43:12 INFO]: [LP] - Instance:
[20:43:12 INFO]: [LP] Static contexts: server=builder-1
[20:43:12 INFO]: [LP] Online Players: 0 (1 unique)
[20:43:12 INFO]: [LP] Uptime: 7h 33m 48s
[20:43:12 INFO]: [LP] Local Data: 0 users, 16 groups, 1 tracks
both connected

Check that the UUIDs match when you run the info command for the user, and that they both show as being online.

Spigot:

BungeeCord:

Issue:
When I update the group on the bungeecord, the event is not triggered. but when I run it on the spigot it is triggered properly.