Hello. So it seems to me, a TileEntity that implements ITickable and overrides the update() function is having some side-related issues. When I open a GUI on the client side my custom Gui class renders the background and overlays as expected. The problem arises if I make the TileEntity update check if the world.isRemote(). If I put the whole update code inside a

if (!world.isRemote())
{
	...
}

the TileEntity seems to update just fine, but the GUI; which is pulling values from a reference to the TileEntity; seems to not be getting those values. I would very much like to only have my machine updating on the server side, and have the GUI be able to display it's power level, status etc like it does just fine with no side checking. How would you reccommend I go about fixing this issue? And an explanation as to what causes it would be appreciated, because it makes no sense to me as the values are being set and read from in a normal manner, so I would assume all the values in the TileEntity are being created as copies on both the client and server sides? Please enlighten me, it's been a long week!  

You need to synchronize your data. 

https://github.com/Draco18s/ReasonableRealism/blob/1.12.1/src/main/java/com/draco18s/farming/entities/TileEntityTanner.java#L174

https://github.com/Draco18s/ReasonableRealism/blob/1.12.1/src/main/java/com/draco18s/farming/entities/TileEntityTanner.java#L95