I found your server here, http://minecraft-mp.com/server-s189497
Many players are looking for 1.12.2 servers, as for myself I don't really care as long as its beyond 1.9ish. I love building with redstone, and observers are great tools that reduce server lag and clean builds up.
Unfortunately your server is advertised as 1.12.2, but the actual build isn't the case, or you don't have observers enabled.
For now it isn't what I'm looking for, I hate chunky torch farms that cause lag, and redstone elevators suffer similarly.
Are you planning on making this a 1.12.2 server as advertised? Or is Observers disabled?
Sorry to here is im sorry its 1.8 - 12.2 we will change the advertisement