Two BlockEntities created when placing block

[1Mangomaster1]

I noticed my GUI's values and the actual values of the BlockEntity(using debugging and watching the behvaiour) I then did a toString() and saw 2 different addressed and debugging the constructor when a block is placed TWO BlockEntities spawn.
I assume one is client sided and one is server sides but idrk.. what I do know is, the changes are surely updated on the server(as said before), but not on the client, so while the beaviour of the blocks change accordingly to the given values, opening the screen doesn't actually show them properly...

I assumed it is server and client because I get the BlockEntity on the Screen using menu.blockEntity (which is client sided)
and on the server I get it by usering ServerPlayer.getContainer.getBlockEntity() (or smth along these lines) so clearly server side...


How do I fix it? I can post code if needed

[1Mangomaster1]

I use the FriendlyBteBuf to send data, I also call setChanged() when my values change.. Idrk what it does but it seemed logical to do so in my set methods...

[1Mangomaster1]

Oh I forgot to register the channel from the constructor(altho I did pass it with the buffer), I did it now, it works. Thank you!