Followed your instructions and everything looks great for about 10 to 15 minutes and then this happens. Only way to fix is to go back to default shader or restart the game.
(Going to default shader and back to SEUS does not fix it)
I turn on F3 about halfway through and it shows im on the latest version. This is a Minecraft Realm.
I get the same issue when trying to use SEUS v1.0.0 renewed. Try using SEUS v11 (the older version). 1.0.0 renewed is not really compatible with MC 1.13.x Or you can try Sildur's shaders.