with this mod enabled the second player to join a multiplayer game gets desyned.

its 0.1.9 version sorry

Yes, more people have reported the same problem. Unfortunately, I'm very busy until monday, so it's hard for me to do anything about it until then.

dont worry i can wait :) - just wanted to let you know.

Same here

So I tried to fix the desync issue last night, but a bug in 0.15.9 is preventing me from testing multiplayer properly.
Rseding does not have access to a linux machine, so he is unable to reproduce the problem, but he believes it has been fixed for 0.15.10.
https://forums.factorio.com/viewtopic.php?f=7&t=46830&p=269748#p269748

I believe I have fixed the desync issue, but until I can test multiplayer, I can't know for sure.
Hopefully 0.15.10 will be out soon, then I can test and release a fixed version.