Update your A3Survival mod.
In some rare cases, steam does not recognize fast enough that a mod has been updated.
In cases like this, go to you launcher, find the mod you want to update and right click on it.
Select “Open Folder” and enter the mods folder.
Go to the addons folder and delete all “.bisign” files.
Repair the mod again and hopefully it will update.
Unless you get kicked from the server or your client crashes, you can safely ignore these.